JP2019071651A - Mobile communication system, csg base station, and mobile terminal - Google Patents

Abstract

To solve the problem in which a mobile terminal endlessly repeats search and sell selection of a lot of inaccessible CSG (Closed Subscriber Group) cells when the mobile terminal is at a location where radio waves from a large number of CSG cells arrive.SOLUTION: When a mobile terminal 1303 is handed over from a CSG base station, a base station provided in a CSG cell 1301 belonging to a closed subscriber group, CSG, to a base station provided in another cell 1302, or from the base station provided in the other cell to the CSG base station, handover over procedures are different if the mobile terminal to be handed over is a CSG terminal belonging to the CSG or if it is a non-CSG terminal not belonging to the CSG.SELECTED DRAWING: Figure 13

Description

  The present invention relates to wireless communication technology.

  Among the communication systems called third generation, W-CDMA (Wideband Code Division Multiple Access) system commercial service has been started in Japan in 2001. Also, by adding a channel for packet transmission (HS-DSCH: High Speed-Downlink Shared Channel) to the downlink (individual data channel, individual control channel), further speeding up of data transmission using downlink is realized. The service of High Speed Down Link Packet Access (HSDPA) to be realized has been started. Furthermore, in order to further speed up data transmission in the uplink direction, services have also been started for the High Speed Up Link Packet Access (HSUPA) system. W-CDMA is a communication method defined by the 3rd Generation Partnership Project (3GPP), which is a standardization body for mobile communication systems, and a release 8 version of a standard document is compiled.

  Also, in 3GPP, as a communication method different from W-CDMA, the whole system configuration including “Long Term Evolution LTE” for wireless section and “core system (also referred to simply as network)” “system A new communication scheme called "architecture evolution" (System Architecture Evolution SAE) is being considered. In LTE, the access scheme, radio channel configuration and protocol are completely different from current W-CDMA (HSDPA / HSUPA). For example, while W-CDMA uses code division multiple access (WDM), LTE uses orthogonal frequency division multiplexing (OFDM) in the downlink and SC-FDMA (single) in the uplink. Use Carrier Frequency Division Multiple Access. Further, the bandwidth can be selected for each base station in 1.4 / 3/5/10/15/20 MHz in LTE, while W-CDMA is 5 MHz. Also, in LTE, circuit switching is not included as in W-CDMA, and only the packet communication method is used.

  LTE is defined as an independent radio access network different from the W-CDMA network because the communication system is configured using a new core network different from the W-CDMA core network (GPRS). Therefore, in order to distinguish from the W-CDMA communication system, in the LTE communication system, a base station (Base station) that communicates with a mobile terminal (UE: User Equipment) is an eNB (E-UTRAN Node B), a plurality of base stations A base station controller (Radio Network Controller) that exchanges control data and user data with each other is called an EPC (Evolved Packet Core) (aGW: sometimes called Access Gateway). In this LTE communication system, Unicast service and E-MBMS service (Evolved Multimedia Broadcast Multicast Service) are provided. The E-MBMS service is a broadcast-type multimedia service and may be referred to simply as MBMS. News, weather forecasts, and large-capacity broadcast contents such as mobile broadcasts are transmitted to a plurality of mobile terminals. This is also referred to as a point to multipoint service.

  The current decisions regarding the overall architecture (Architecture) in LTE systems in 3GPP are described in Non-Patent Document 1. The overall architecture (Chapter 4 of Non-Patent Document 1) will be described using FIG. FIG. 1 is an explanatory view showing a configuration of a communication system according to the LTE system. In FIG. 1, a control protocol (for example, RRC (Radio Resource Management)) and a user plane (for example, PDCP: Packet Data Convergence Protocol, RLC: Radio Link Control, MAC: Medium Access Control, PHY: Physical layer) for the mobile terminal 101 are base stations. If terminating at station 102, E-UTRAN (Evolved Universal Terrestrial Radio Access) is configured by one or more base stations 102. The base station 102 performs scheduling (scheduling) and transmission of paging signals (Paging Signaling, also referred to as paging messages) notified from the MME 103 (Mobility Management Entity). The base stations 102 are connected to each other by an X2 interface. The base station 102 is also connected to an EPC (Evolved Packet Core) by an S1 interface, more specifically to an MME 103 (Mobility Management Entity) by an S1_MME interface, and connected to an S-GW 104 (Serving Gateway) by an S1_U interface. Ru. The MME 103 distributes paging signals to a plurality of or a single base station 102. Also, the MME 103 performs mobility control in the idle state. The MME 103 manages a tracking area list when the mobile terminal is in the standby state and in the active state. The S-GW 104 transmits and receives user data to and from one or more base stations 102. The S-GW 104 becomes a local mobility anchor point (Mobility Anchor Point) at the time of handover between base stations. Furthermore, a P-GW (PDN Gateway) exists, and performs packet filtering for each user, assignment of a UE-ID address, and the like.

  The current decisions regarding frame configuration in the LTE system in 3GPP are described in Non-Patent Document 1 (Chapter 5). This will be described with reference to FIG. FIG. 2 is an explanatory view showing a configuration of a radio frame used in the communication system of the LTE system. In FIG. 2, one radio frame (Radio frame) is 10 ms. The radio frame is divided into ten equally sized sub-frames. The subframe is divided into two equal sized slots. The downlink synchronization signal (SS) is included in the first (# 0) and sixth (# 5) subframes for each frame. The synchronization signal includes a primary synchronization signal (P-SS) and a secondary synchronization signal (S-SS). Channel multiplexing for MBSFN (Multimedia Broadcast Multicast Service Single Frequency Network) and channels other than MBSFN is performed in subframe units. Hereinafter, subframes for MBSFN transmission will be referred to as MBSFN subframes (MBSFN sub-frames). Non-Patent Document 2 describes an example of signaling upon allocation of MBSFN subframes. FIG. 3 is an explanatory view showing the configuration of the MBSFN frame. In FIG. 3, MBSFN subframes are allocated to each MBSFN frame (MBSFN frame). A set of MBSFN frames (MBSFN frame Cluster) is scheduled. A repetition period of a set of MBSFN frames is assigned.

  The current decisions on channel configuration in LTE systems in 3GPP are described in Non-Patent Document 1. It is assumed that the same channel configuration as that of the non-CSG cell is also used in the CSG (Closed Subscriber Group cell) cell. The physical channel (Physical channel) (chapter 5 of non-patent document 1) will be described with reference to FIG. FIG. 4 is an explanatory diagram for explaining physical channels used in the communication system according to the LTE system. In FIG. 4, a physical broadcast channel 401 (Physical Broadcast channel: PBCH) is a downlink channel transmitted from the base station 102 to the mobile terminal 101. The BCH transport block (transport block) is mapped to four subframes in a 40 ms interval. There is no explicit signaling of 40 ms timing. Physical Control Channel Format Indicator Channel 402 (Physical Control Format Indicator Channel: PCFICH) is transmitted from the base station 102 to the mobile terminal 101. The PCFICH notifies the mobile terminal 101 from the base station 102 of the number of OFDM symbols used for PDCCHs. The PCFICH is transmitted every subframe. A physical downlink control channel 403 (PDCCH) is a downlink channel transmitted from the base station 102 to the mobile terminal 101. PDCCH is resource allocation (allocation), HARQ information on DL-SCH (downlink shared channel which is one of the transport channels shown in FIG. 5), and PCH (paging which is one of the transport channels shown in FIG. 5) Notify the channel). The PDCCH carries an uplink scheduling grant (Uplink Scheduling Grant). The PDCCH carries ACK / Nack which is a response signal to uplink transmission. The PDCCH is also called L1 / L2 control signal. The physical downlink shared channel 404 (PDSCH) is a downlink channel transmitted from the base station 102 to the mobile terminal 101. As PDSCH, DL-SCH (downlink shared channel) which is a transport channel and PCH which is a transport channel are mapped. A physical multicast channel 405 (Physical multicast channel: PMCH) is a downlink channel transmitted from the base station 102 to the mobile terminal 101. The PMCH is mapped to a transport channel MCH (multicast channel).

  A physical uplink control channel 406 (PUCCH) is an uplink channel transmitted from the mobile terminal 101 to the base station 102. PUCCH carries ACK / Nack which is a response signal (response) to downlink transmission. The PUCCH carries a CQI (Channel Quality Indicator) report. The CQI is quality information indicating the quality of received data or channel quality. Also, the PUCCH carries a Scheduling Request (SR). A physical uplink shared channel 407 (PUSCH) is an uplink channel transmitted from the mobile terminal 101 to the base station 102. In PUSCH, UL-SCH (uplink shared channel which is one of the transport channels shown in FIG. 5) is mapped. A physical HARQ indicator channel 408 (Physical Hybrid ARQ indicator channel: PHICH) is a downlink channel transmitted from the base station 102 to the mobile terminal 101. The PHICH carries an ACK / Nack that is a response to uplink transmission. The physical random access channel 409 (PRACH) is an uplink channel transmitted from the mobile terminal 101 to the base station 102. The PRACH carries a random access preamble.

  As a downlink reference signal (Reference signal), symbols known as a mobile communication system are inserted into the first, third and last OFDM symbols of each slot. Reference symbol received power (RSRP) is a measurement of the physical layer of the mobile terminal.

  The transport channel (Transport channel) will be described with reference to FIG. FIG. 5 is an explanatory diagram for explaining transport channels used in the communication system according to the LTE system. FIG. 5A shows the mapping between the downlink transport channel and the downlink physical channel. FIG. 5B shows the mapping between the uplink transport channel and the uplink physical channel. A broadcast channel (BCH) for the downlink transport channel is broadcasted to the entire base station (cell). The BCH is mapped to a physical broadcast channel (PBCH). Retransmission control based on HARQ (Hybrid ARQ) is applied to the downlink shared channel (DL-SCH). Broadcasting to the entire base station (cell) is possible. Supports dynamic or semi-static resource allocation. Quasi-static resource allocation is also referred to as persistent scheduling. Supports DRX (Discontinuous reception) of the mobile terminal to reduce power consumption of the mobile terminal. The DL-SCH is mapped to a physical downlink shared channel (PDSCH). Paging channel (PCH) supports DRX of the mobile terminal to enable low power consumption of the mobile terminal. Broadcasting to the entire base station (cell) is required. It is mapped to a physical resource such as a physical downlink shared channel (PDSCH) that can be dynamically used for traffic, or a physical resource such as a physical downlink control channel (PDCCH) of another control channel. A multicast channel (Multicast channel: MCH) is used for broadcast to the entire base station (cell). Supports SFN combining of MBMS services (MTCH and MCCH) in multi-cell transmission. Support semi-static resource allocation. MCH is mapped to PMCH.

  Retransmission control by Hybrid ARQ (HARQ) is applied to the Uplink Shared Channel (UL-SCH). Supports dynamic or semi-static resource allocation. The UL-SCH is mapped to a physical uplink shared channel (PUSCH). The random access channel (RACH) shown in FIG. 5B is limited to control information. There is a risk of conflict. The RACH is mapped to a physical random access channel (PRACH). The HARQ will be described.

  HARQ is a technology for improving the communication quality of a transmission path by a combination of Automatic Repeat reQuest and Forward Error Correction. There is an advantage that error correction effectively functions by retransmission even for a transmission path in which the communication quality changes. In particular, it is also possible to obtain further quality improvement by combining the reception result of the initial transmission and the reception result of the retransmission in the retransmission. An example of a retransmission method will be described. If the reception side can not correctly decode the received data (if a CRC Cyclic Redundancy Check error occurs (CRC = NG)), the reception side transmits “Nack” to the transmission side. The transmitter that has received "Nack" retransmits the data. If the reception side can correctly decode the received data (if a CRC error does not occur (CRC = OK)), the reception side transmits "Ack" to the transmission side. The transmitter that has received "Ack" transmits the following data. "Chase combining" is an example of the HARQ method. Chase combining is to transmit the same data sequence for initial transmission and retransmission, and is a method for improving gain by combining the data sequence for initial transmission and the data sequence for retransmission in retransmission. This includes partially accurate data even if there is an error in the initial transmission data, and the idea that data can be transmitted with higher accuracy by combining the initial transmission data of the correct part and the retransmission data. Is based on Also, IR (Incremental Redundancy) is another example of the HARQ scheme. IR is to increase redundancy, and by transmitting parity bits in retransmission, to combine with initial transmission to increase redundancy and to improve quality by error correction function.

  A logical channel (Logical channel) will be described with reference to FIG. FIG. 6 is an explanatory diagram for explaining logical channels used in the communication system according to the LTE system. FIG. 6A shows the mapping between the downlink logical channel and the downlink transport channel. FIG. 6B shows the mapping between uplink logical channels and uplink transport channels. A broadcast control channel (BCCH) is a downlink channel for broadcast system control information. The BCCH which is a logical channel is mapped to a broadcast channel (BCH) which is a transport channel or a downlink shared channel (DL-SCH). A paging control channel (PCCH) is a downlink channel for transmitting a paging signal. The PCCH is used when the network does not know the cell location of the mobile terminal. The logical channel PCCH is mapped to a transport channel paging channel (PCH). The common control channel (CCCH) is a channel for transmission control information between the mobile terminal and the base station. The CCCH is used when the mobile terminal does not have an RRC connection (connection) with the network. In the downlink method, the CCCH is mapped to a downlink shared channel (DL-SCH), which is a transport channel. In the uplink, the CCCH is mapped to an uplink shared channel (UL-SCH), which is a transport channel.

  A multicast control channel (MCCH) is a downlink channel for one-to-many transmission. It is a channel used for transmission of MBMS control information for one or several MTCHs from the network to the mobile terminal. The MCCH is a channel used only for mobile terminals that are receiving MBMS. The MCCH is mapped to a downlink shared channel (DL-SCH) or a multicast channel (MCH), which is a transport channel. Dedicated control channel (DCCH) is a channel for transmitting dedicated control information between the mobile terminal and the network. The DCCH is mapped to the uplink shared channel (UL-SCH) in uplink and mapped to the downlink shared channel (DL-SCH) in downlink. The Dedicated Traffic Channel (DTCH) is a channel of one-to-one communication to individual mobile terminals for transmission of user information. The DTCH exists in both the upstream and the downstream. The DTCH is mapped to the uplink shared channel (UL-SCH) in uplink and mapped to the downlink shared channel (DL-SCH) in downlink. The Multicast Traffic Channel (MTCH) is a downlink channel for traffic data transmission from the network to the mobile terminal. MTCH is a channel used only for mobile terminals that are receiving MBMS. The MTCH is mapped to a downlink shared channel (DL-SCH) or a multicast channel (MCH).

  The GCI is a Global Cell Identity. A CSG cell (Closed Subscriber Group cell) is introduced in LTE and Universal Mobile Telecommunication System (UMTS). The CSG will be described below (non-patent document 7 chapter 3.1). A CSG (Closed Subscriber Group) is a cell in which an operator specifies an available subscriber (cell for a specific subscriber). The identified subscriber is authorized to access one or more E-UTRAN cells of Public Land Mobile Network (PLMN). One or more E-UTRAN cells to which the identified subscriber is authorized to access are called "CSG cells (s)". However, PLMN has access restrictions. A CSG cell is a part of PLMN that broadcasts a unique CSG identity (CSG identity: CSG ID, CSG-ID). The members of the subscriber group who has been registered for use in advance and are authorized access the CSG cell using the CSG-ID, which is access permission information. The CSG-ID is broadcasted by the CSG cell or cell. A plurality of CSG-IDs exist in the mobile communication system. And, the CSG-ID is used by the terminal (UE) to facilitate access of CSG related members. It is discussed in the 3GPP meeting that a CSG cell or information broadcasted by the cell is replaced with a tracking area code (TAC) instead of the CSG-ID. Location tracking of a mobile terminal is performed in units of areas consisting of one or more cells. The position tracking is to make it possible to track the position of the mobile terminal and to make a call (incoming call by the mobile terminal) even in a non-communication state (standby state). The area for tracking the position of the mobile terminal is called a tracking area. The CSG White List is a list stored in the USIM in which all CSG IDs of CSG cells to which a subscriber belongs are recorded. The white list in the mobile terminal is given by the upper layer. Thereby, the base station of the CSG cell allocates radio resources to the mobile terminal.

  The "suitable cell" (Suitable cell) will be described below (non-patent document 7 chapter 4.3). The “suitable cell” is a cell that the UE camps on in order to receive a normal service. Such cells are provided by: (1) the cell is part of a selected or registered PLMN, or part of an "Equivalent PLMN list" PLMN; (2) NAS (non-access stratum) To meet the following conditions in the latest information: (1) The cell is not barred. (2) The cell is not part of the "forbidden LAs for roaming" list but is part of at least one Tracking Area (TA). In that case, the cell needs to satisfy the above (1), (3) the cell meets the cell selection evaluation criteria, and (4) the cell is a CSG cell as system information (System Information: SI) For the cell identified by), the CSG-ID should be part of the UE's "CSG White List" (CSG White List) (to be included in the UE's CSG White List).

  The following describes the "acceptable cell" (non-patent document 7 chapter 4.3). This is a cell that the UE camps on to receive a limited service (emergency call). Such cell shall satisfy all the following requirements. That is, the minimum set of requirements for initiating an emergency call in the E-UTRAN network is shown below. (1) The cell is not a barred cell. (2) The cell satisfies the cell selection evaluation criteria.

  To camp on a cell means that the UE has completed the cell selection / reselection process and the UE has selected a cell for monitoring system information and paging information.

3GPP TS 36.300 V8.6.0 3GPP R1-072963 3GPP TR R3.020 V0.6.0 3GPP R2-082899 3GPP R2-083494 3GPP TS 36.331 V8.3.0 3GPP TS 36.304 V8.3.0 3GPP R2-084346 3GPP S1-083461 3GPP R2-093950 3GPP R2-093864 3GPP R2-093138 3GPP TS 36.213 3GPP TS 36.101

  Many CSG (Closed Subscriber Group cell) cells are required to be installed in condominiums, schools, companies, and the like. For example, a CSG cell is installed for each room in an apartment, in each classroom in a school, and for each section in a company, and a usage method is required such that only users registered in each CSG cell can use the CSG cell. Furthermore, CSG cells are assumed to be portable in size and weight, and it is also required that installation and removal of these CSG cells be performed frequently and flexibly. In consideration of such a request, radio waves from a large number of CSG cells will be transmitted simultaneously at a certain point. That is, in a condominium, a school, a company, etc., a situation occurs in which the mobile terminal is in a position where radio waves from many CSG cells can reach.

  In addition, the CSG cell is installed in a place where radio waves from non-CSG cells do not reach, and it is required to enable communication with a mobile terminal via the CSG cell. For example, at present, there are many situations where the room of the apartment does not reach radio waves from non-CSG cells. In such a case, a CSG cell is installed in each apartment room, and a CSG is configured by each CSG cell in each room, and a CSG-ID is given. For example, it is conceivable that mobile terminals owned by residents of each room register the user access to the CSG cell of each room. In such a situation, the mobile terminal does not receive radio waves from non-CSG cells, but exists in a place where radio waves from many CSG cells can reach. Also, in such a case, depending on the radio wave propagation environment, the radio waves from the CSG cell for which user access is registered may not reach the mobile terminal, or the received power may be weaker than other CSG cells even if they arrive. Do.

  Thus, in the case of a mobile terminal located at a position where radio waves from many CSG cells reach, the situation where search and cell selection are repeated endlessly for many inaccessible CSG cells (that is, CSG cells not registered for user access). Will occur. In such a case, control delay and radio resource utilization efficiency and signaling efficiency are reduced in the system. In addition, there arises a problem that the power consumption of the mobile terminal which repeats the cell search is increased. These problems become important problems when assuming the future CSG cell deployment as described above. The present invention has been made to solve these problems.

  A mobile communication system according to the present invention is provided in a CSG base station, which is a base station provided in a CSG cell belonging to a CSG of a closed subscriber group, to a base station provided in another cell or in another cell. In the mobile communication system in which the mobile terminal performs a handover from the base station to the CSG base station, and the mobile terminal to be handed over is a CSG terminal belonging to the CSG and a non-CSG terminal not belonging to the CSG, It is characterized in that the handover procedure is different.

  The CSG base station according to the present invention is a base station provided in a CSG cell belonging to the CSG of a closed subscriber group, and the mobile terminal is handed over to a base station provided in another cell, or to another cell A procedure of handover in the case of a CSG base station to which the mobile terminal performs handover from the provided base station and the mobile terminal to be handed over is a CSG terminal belonging to the CSG and a non-CSG terminal not belonging to the CSG Are different from each other.

  A mobile terminal according to the present invention is a base station provided in another cell from a CSG base station which is a base station provided in a CSG cell belonging to a closed subscriber group CSG, or a base provided in another cell The handover procedure is different between the case where the mobile terminal that is handed over from the station to the CSG base station and the mobile terminal to be handed over is a CSG terminal that belongs to the CSG and a non-CSG terminal that does not belong to the CSG. It is characterized by

  According to the present invention, the mobile terminal can obtain a list of cells for specific subscribers for which access is permitted.

It is an explanatory view showing the composition of the communications system of a LTE system. It is an explanatory view showing the composition of the communications system of a LTE system. It is explanatory drawing which shows the structure of the radio | wireless frame used by the communication system of a LTE system. It is explanatory drawing which shows the structure of a MBSFN (Multimedia Broadcast multicast service Single Frequency Network) frame. It is explanatory drawing explaining the physical channel used by the communication system of a LTE system. It is explanatory drawing explaining the transport channel used by the communication system of a LTE system. It is an explanatory view explaining a logical channel used with a communication system of a LTE system. FIG. 1 is a block diagram showing an overall configuration of a mobile communication system currently discussed in 3GPP. It is a block diagram which shows the structure of the mobile terminal 311 which concerns on this invention. It is a block diagram which shows the structure of base station 312 which concerns on this invention. It is a block diagram showing composition of MME concerning the present invention. It is a block diagram showing composition of HeNBGW concerning the present invention. It is a flowchart which shows the outline of the cell search which a mobile terminal (UE) performs in the communication system of a LTE system. It is a cell conceptual diagram in case many CSG cells exist. It is a flowchart of a cell search of the mobile terminal in the position which the electromagnetic wave from many Home-eNB reaches. FIG. 7 is a sequence diagram for notifying of PCI split information in the first embodiment. 7 is a flowchart of cell search of a mobile terminal in the first embodiment. FIG. 16 shows a sequence diagram for notifying of PCI split information in the first modification of the first embodiment. It is a sequence diagram which alert | reports PCI split information of another frequency layer. It is a figure which shows the case where Home-eNB exists in the area of eNB. FIG. 7 is a sequence diagram of a method for notifying a whitelist via a non-CSG cell, which is discussed in 3GPP. It is a figure which shows the case where Home-eNB (CSG cell) which the mobile terminal registered becomes out of the area of a non-CSG cell. FIG. 21 is a sequence diagram when a mobile terminal having no white list in the third embodiment activates a manual search. It is a figure which shows the case where a mobile terminal is not under the umbrella of a non-CSG cell but under the umbrella of many CSG cells. FIG. 20 is a sequence diagram when manual search is performed in the fourth embodiment. FIG. 10 is a sequence diagram of a method of transmitting a whitelist message prior to transmitting a TAU reject. FIG. 21 is a sequence diagram of the method disclosed in the first modification of the fifth embodiment. When a TAU reject message is received once from the same cell, it is a sequence diagram of the method which a mobile terminal prohibits establishment of the RRC connection to this cell. It is a figure which shows the process in the mobile terminal at the time of providing a timer. FIG. 31 is a sequence diagram of a method of transmitting a registration message of a white list before transmitting an n-th TAU reject message in the seventh embodiment. When a RRC connection reject message is received once from the same cell, it is a sequence diagram of a method to which the mobile terminal prohibits the RRC connection request | requirement to this cell. It is a sequence diagram of the method of transmitting the registration message of a whitelist, before the CSG cell which belongs to CSG-ID which the mobile terminal has not registered user access transmits an RRC connection reject message. FIG. 24 is a sequence diagram of a method for returning Ack / Nack of success / failure of reception of a whitelist (update) message in Embodiment 11; It is a flowchart which shows the process of the mobile terminal concerning the RRC connection re-establishment. It is a flowchart which shows the process of the mobile terminal concerning RRC connection re-establishment at the time of introduce | transducing a CSG cell. It is a flowchart which shows the process of the mobile terminal concerning the RRC connection re-establishment at the time of providing separately the whitelist useful and whitelist uselessness timer of the allowance time until it selects the cell in E-UTRA. It is a flowchart which shows the process of the mobile terminal concerning RRC connection reset at the time of notifying the timer of a white list useful from a CSG cell. It is a flowchart which shows the process of the mobile terminal concerning RRC connection reset at the time of notifying the timer of a white list useful from a CSG cell. It is a flowchart which shows the process of the mobile terminal in connection with the priority of a prior art. It is a flowchart which shows a process of the mobile terminal at the time of separately providing a white list useful and white list useless priority. It is a flowchart which shows a process of the mobile terminal at the time of separately providing the whitelist useful and white list useless effective time of priority. It is a flowchart which shows a process of the mobile terminal in the cell reselection procedure of a prior art. It is a flowchart which shows a process of the mobile terminal in the cell reselection procedure using the period which performs measurement for cell reselection, even if the state of the serving cell is good, even if the state of the serving cell is good. Flow chart showing the processing of the mobile terminal in the cell reselection procedure using the cycle and the offset value to perform measurement for cell reselection even if the mobile terminal having CSG-ID in the whitelist is good even if the state of the serving cell is good It is. The mobile terminal having the CSG-ID in the whitelist cancels the cycle of performing measurement for cell reselection even when the state of the serving cell is good and the cycle of performing measurement when cell reselection can not be performed. It is a flowchart which shows a process of the mobile terminal in a cell reselection procedure. Flow chart showing the processing of the mobile terminal in the cell reselection procedure using the metric for the mobile terminal with CSG-ID in the whitelist to start cell reselection for mobile terminals with CSG-ID in the whitelist It is. It is a flowchart which shows a process of the mobile terminal at the time of providing an offset separately for UE which has CSG-ID in a whitelist, and UE for not so that the reselection procedure to a hybrid cell is different. It is a flowchart which shows the cell reselection procedure processing of the mobile terminal at the time of combining Embodiment 15 and the method of providing an offset separately. It is a flowchart which shows the cell reselection procedure process of the mobile terminal at the time of providing separately an offset, in order to make cell reselection from a hybrid cell difficult. It is a conceptual diagram at the time of making UE of a CSG member stay longer than UE of a non-CSG member in a hybrid cell. It is an example of a procedure to PRACH initial transmission in a hybrid cell. It is a procedure outline to PRACH initial transmission in a hybrid cell in the case of using a difference of a cell reselection threshold.

Embodiment 1
FIG. 7 is a block diagram showing the overall configuration of an LTE mobile communication system currently being discussed in 3GPP. Currently in 3GPP, CSG (Closed Subscriber Group) cells (Home-eNodeB (Home-eNB, HeNB) of e-UTRAN, Home-NB (HNB) of UTRAN) and non-CSG cells (eNodeB (eNB of e-UTRAN) The entire configuration of the system including the UTRAN Node B (NB) and the GERAN BSS) is under consideration, and for e-UTRAN, the configuration as shown in (a) or (b) of FIG. It has been proposed (Non-Patent Document 1, Non-Patent Document 3). FIG. 7A will be described. The mobile terminal (UE) 71 performs transmission and reception with the base station 72. The base station 72 is classified into an eNB (non-CSG cell) 72-1 and a Home-eNB (CSG cell) 72-2. The eNB 72-1 is connected to the MME 73 by the interface S1, and control information is communicated between the eNB and the MME. A plurality of MMEs are connected to one eNB. The Home-eNB 72-2 is connected to the MME 73 by the interface S1, and control information is communicated between the Home-eNB and the MME. Multiple Home-eNBs are connected to one MME.

  Next, FIG. 7B will be described. The mobile terminal (UE) 71 performs transmission and reception with the base station 72. The base station 72 is classified into an eNB (non-CSG cell) 72-1 and a Home-eNB (CSG cell) 72-2. As in FIG. 7A, the eNB 72-1 is connected to the MME 73 by the interface S1, and control information is communicated between the eNB and the MME. A plurality of MMEs are connected to one eNB. On the other hand, Home-eNB 72-2 is connected with MME 73 via HeNBGW (Home-eNB GateWay) 74. Home-eNB and HeGW are connected by interface S1, and HeNBGW 74 and MME 73 are connected via interface S1_flex. One or more Home-eNBs 72-2 are connected to one HeNBGW 74, and information is communicated through S1. The HeNBGW 74 is connected to one or more MMEs 73, and information is communicated through S1_flex.

  By connecting one HeNBGW 74 with a Home-eNB belonging to the same CSG-ID using the configuration of FIG. 7 (b), a plurality of pieces of the same information, such as registration information, belong to the same CSG-ID from MME 73 When transmitting to Home-eNB 72-2, by transmitting to HeNBGW 74 once and transmitting to multiple Home-eNBs 72-2 from there, it is more efficient than transmitting directly to multiple Home-eNBs 72-2 respectively. Can be enhanced. On the other hand, when each Home-eNB 72-2 communicates individual information with the MME 73, the Home-eNB 72-2 can be transmitted through the HeNBGW 74 but only processed (passed) without processing the information there. And MME 73 can also communicate as if they were directly connected.

  FIG. 8 is a block diagram showing a configuration of a mobile terminal (terminal 71 of FIG. 7) according to the present invention. The transmission process of the mobile terminal shown in FIG. 8 will be described. First, control data from the protocol processing unit 801 and user data from the application unit 802 are stored in the transmission data buffer unit 803. The data stored in the transmission data buffer unit 803 is passed to the encoder unit 804 and subjected to encoding processing such as error correction. There may be data that is directly output from the transmission data buffer unit 803 to the modulation unit 805 without performing the encoding process. A modulation unit 805 performs modulation processing on the data encoded by the encoder unit 804. The modulated data is converted to a baseband signal, and then output to the frequency conversion unit 806 to be converted to a wireless transmission frequency. Thereafter, a transmission signal is transmitted from the antenna 807 to the base station 312. Also, the reception process of the mobile terminal 311 is performed as follows. A radio signal from base station 312 is received by antenna 807. The received signal is converted from the radio reception frequency to a baseband signal by the frequency conversion unit 806, and demodulation processing is performed by the demodulation unit 808. The data after demodulation is passed to the decoder unit 809 and decoding processing such as error correction is performed. Among the decoded data, control data is passed to the protocol processing unit 801, and user data is passed to the application unit 802. A series of processing of the mobile terminal is controlled by the control unit 810. Therefore, the control unit 810 is connected to each unit (801 to 809), which is omitted in the drawing.

  FIG. 9 is a block diagram showing a configuration of a base station (base station 72 of FIG. 7) according to the present invention. The transmission process of the base station shown in FIG. 9 will be described. The EPC communication unit 901 transmits and receives data between the base station 72 and the EPC (such as MME 73 and HeNBGW 74). The other base station communication unit 902 transmits and receives data to and from other base stations. The EPC communication unit 901 and the other base station communication unit 902 exchange information with the protocol processing unit 903 respectively. Control data from the protocol processing unit 903 and user data and control data from the EPC communication unit 901 and the other base station communication unit 902 are stored in the transmission data buffer unit 904. The data stored in the transmission data buffer unit 904 is passed to the encoder unit 905, and is subjected to encoding processing such as error correction. There may be data that is directly output from the transmission data buffer unit 904 to the modulation unit 906 without performing the encoding process. A modulation unit 906 performs modulation processing on the encoded data. The modulated data is converted to a baseband signal, output to the frequency conversion unit 907, and converted to a wireless transmission frequency. Thereafter, a transmission signal is transmitted from the antenna 908 to one or more mobile terminals 71. Also, the reception process of the base station 72 is performed as follows. Radio signals from one or more mobile terminals 311 are received by the antenna 908. The received signal is converted from the radio reception frequency to a baseband signal by the frequency conversion unit 907, and demodulation processing is performed by the demodulation unit 909. The demodulated data is passed to the decoder unit 910, where decoding processing such as error correction is performed. Among the decoded data, control data is passed to the protocol processing unit 903 or the EPC communication unit 901, and the other base station communication unit 902, and user data is passed to the EPC communication unit 901 and the other base station communication unit 902. A series of processes of the base station 72 are controlled by the control unit 911. Therefore, although the control unit 911 is omitted in the drawing, it is connected to each unit (901 to 910).

  FIG. 10 is a block diagram showing a configuration of an MME (Mobility Management Entity) according to the present invention. The PDN GW communication unit 1001 transmits and receives data between the MME 73 and the PDN GW. The base station communication unit 1002 transmits and receives data between the MME 73 and the base station 72 via the S1 interface. If the data received from the PDN GW is user data, the user data is passed from the PDN GW communication unit 1001 to the base station communication unit 1002 via the user plane processing unit 1003 and transmitted to one or more base stations 72. Ru. If the data received from the base station 72 is user data, the user data is passed from the base station communication unit 1002 to the PDN GW communication unit 1001 via the user plane processing unit 1003 and transmitted to the PDN GW.

  If the data received from the PDN GW is control data, the control data is passed from the PDN GW communication unit 1001 to the control plane control unit 1005. If the data received from the base station 72 is control data, the control data is passed from the base station communication unit 1002 to the control plane control unit 1005. The HeNBGW communication unit 1004 is provided when the HeNBGW 74 exists, and transmits and receives data by the interface (IF) between the MME 73 and the HeNBGW 74 according to the information type. Control data received from the HeNBGW communication unit 1004 is passed from the HeNBGW communication unit 1004 to the control plane control unit 1005. The result of the process in the control plane control unit 1005 is transmitted to the PDN GW via the PDN GW communication unit 1001. In addition, the result processed by the control plane control unit 1005 is transmitted to one or more base stations 72 via the base station communication unit 1002 via the S1 interface, and to one or more HeNBGW 74 via the HeNBGW communication unit 1004. Will be sent.

  The control plane control unit 1005 includes an NAS security unit 1005-1, an SAE bearer control unit 1005-2, an idle state (Idle State) mobility management unit 1005-3, and the like, and performs overall processing for the control plane. The NAS security unit 1005-1 performs security of NAS (Non-Access Stratum) messages and the like. The SAE bearer control unit 1005-2 manages bearers of SAE (System Architecture Evolution). The idle state mobility management unit 1005-3 performs mobility management in a standby state (LTE-IDLE state, also referred to simply as idle), generation and control of a paging signal in the standby state, and one or more mobile terminals 71 affiliated with the mobile terminal 71. Add, delete, update, search for tracking area (TA), and manage tracking area list (TA List). The MME starts a paging protocol by transmitting a paging message to a cell belonging to a tracking area (tracking area: TA) in which the UE is registered. Management of the CSG of the Home-eNB 72-2 connected to the MME, management of the CSG-ID, and management of the white list may be performed by the idle state mobility management unit 1005-3. In the management of the CSG-ID, the relationship between the mobile terminal corresponding to the CSG-ID and the CSG cell is managed (added, deleted, updated, searched). For example, it may be a relationship between one or more mobile terminals registered for user access in a certain CSG-ID and a CSG cell belonging to the CSG-ID. In whitelist management, the relationship between the mobile terminal and the CSG-ID is managed (added, deleted, updated, searched). For example, the whitelist may store one or more CSG-IDs registered by a certain mobile terminal. Although management with respect to these CSGs may be performed in other parts in MME 73, tracking performed instead of CSG-ID currently discussed in 3GPP meetings by performing in idle state mobility management section 1005-3. A method using an area code (Tracking Area Code) can be performed efficiently. A series of processes of the MME 313 are controlled by the control unit 1006. Therefore, although the control unit 1006 is omitted in the drawing, it is connected to each unit (1001 to 1005).

  FIG. 11 is a block diagram showing the configuration of the HeNBGW according to the present invention. The EPC communication unit 1101 transmits and receives data between the HeNBGW 74 and the MME 73 using the S1_flex interface. The base station communication unit 1102 transmits and receives data between the HeNBGW 74 and the Home-eNB 72-2 via the S1 interface. The location processing unit 1103 performs a process of transmitting registration information such as registration information among data from the MME 73 delivered via the EPC communication unit 1101 to a plurality of Home-eNBs. The data processed by the location processing unit 1103 is passed to the base station communication unit 1102 and transmitted to one or more Home-eNBs 72-2 via the S1 interface. Data that is not required to be processed by the location processing unit 1103 and is only passed (transmitted) is passed from the EPC communication unit 1101 to the base station communication unit 1102, and is transmitted to one or more Home-eNBs 72-2 via the S1 interface. Will be sent. A series of processes of the HeNBGW 74 are controlled by the control unit 1104. Therefore, although the control unit 1104 is omitted in the drawing, it is connected to each unit (1101 to 1103).

  Next, an example of a general cell search method in a mobile communication system will be shown. FIG. 12 is a flowchart showing an outline from cell search to a standby operation performed by the mobile terminal (UE) in the communication system according to the LTE system. When cell search is started in the mobile terminal, slot timing and frame timing using the first synchronization signal (P-SS) and the second synchronization signal (S-SS) transmitted from neighboring base stations in step ST1201. Synchronize the In P-SS and S-SS, a synchronization code is assigned to the synchronization signal (SS) in a one-to-one correspondence with PCI (Physical Cell Identity) assigned to each cell. The number of PCIs currently under consideration is 504. The 504 PCIs are used to synchronize and detect (identify) PCIs of synchronized cells. Next, with respect to the synchronized cell, in step ST1202, a reference signal RS (Reference Signal) transmitted from the base station for each cell is detected, and reception power is measured. A code corresponding to PCI and one-to-one is used for the reference signal RS, and can be separated from other cells by correlating with the code. By deriving a code for RS of the cell from the PCI specified in ST1201, it becomes possible to detect RS and measure RS received power. Next, in ST1203, among the one or more cells detected up to ST1202, a cell with the best RS reception quality (for example, a cell best cell with the highest RS received power) is selected. Next, in ST 1204, the PBCH of the best cell is received to obtain BCCH which is broadcast information. The BCCH on the PBCH carries a MIB (Master Information Block) containing cell configuration information. As information on the MIB, for example, there are DL (downlink) system bandwidth, the number of transmitting antennas, SFN (System Frame Number) and the like.

  Next, at 1205, the DL-SCH of the cell is received based on the cell configuration information of the MIB, and the SIB (System Information Block) 1 in the broadcast information BCCH is obtained. The SIB 1 includes information on access to the cell, information on cell selection, and scheduling information on other SIB (SIB k; an integer of k ≧ 2). In addition, SIB1 includes a TAC (Tracking Area Code). Moreover, CSG-ID may be contained in SIB1. Next, in ST 1206, the mobile terminal compares the TAC received in ST 1205 with the TAC already held by the mobile terminal. As a result of comparison, if the same, the cell enters a standby operation. If different by comparison, the mobile terminal requests a change of TA to perform tracking area update (TAU) to the core network (Core Network, EPC) (including MME and the like) through the cell. The core network updates the TA based on the identification number (UE-ID etc.) of the mobile terminal sent from the mobile terminal together with the TAU request signal. The core network transmits a TAU receipt signal to the mobile terminal after updating the TA. The mobile terminal rewrites (updates) the TAC (or TAC list) held by the mobile terminal with the TAC of the cell. The mobile terminal then enters a standby operation in the cell.

  In LTE and Universal Mobile Telecommunication System (UMTS), the introduction of a Closed Subscriber Group (CSG) cell is being considered. As described above, access is permitted only to one or more mobile terminals registered in the CSG cell. One or more mobile terminals registered with a CSG cell constitute one CSG. A CSG configured in this way is assigned a unique identification number called CSG-ID. Note that one CSG may have a plurality of CSG cells. If a mobile terminal registers in any one CSG cell, it can access other CSG cells of the CSG to which the CSG cell belongs. Moreover, Home-eNB in LTE and Home-NB in UMTS may be used as a CSG cell. One or more CSG cells included in one CSG-ID belong to the same TA. For this reason, one or more CSG cells included in one CSG-ID broadcast the same TAC on the broadcast information to mobile terminals under the control. Mobile terminals registered in the CSG cell have a white list. Specifically, the whitelist is stored in SIM / USIM. The whitelist contains CSG information of CSG cells registered by the mobile terminal. Specifically as CSG information, CSG-ID, TAI (Tracking Area Identity), TAC etc. can be considered. As long as CSG-ID and TAC are matched, either one may be sufficient. Also, GCI may be used if CSG-ID or TAC and GCI (Global Cell Identity) are associated. From the above, it is impossible for the mobile terminal which does not have the whitelist (in the present invention, including the case where the whitelist is empty) to access the CSG cell, and only the non-CSG cell is accessed. Can not. On the other hand, the mobile terminal having the whitelist can access the CSG cell of the registered CSG-ID as well as the non-CSG cell.

  A problem arises when the mobile terminal performs cell search in the presence of many CSG cells. FIG. 13 shows a cell conceptual diagram in the case where there are many CSG cells. In the figure, 1301 denotes a non-CSG cell by eNB, and 1302 denotes a CSG cell by Home-eNB. 1303 is a mobile terminal. Many CSG cells are required to be installed in condominiums, schools, companies, etc. The CSG cell is installed for each room in each apartment, each classroom in each school, each section in each company, and a usage method is required to enable only the users registered in each CSG cell to use the CSG cell. . Furthermore, CSG cells are assumed to be portable in size and weight, and it is also required that installation and removal of these CSG cells be performed frequently and flexibly. In consideration of such a request, radio waves from a large number of CSG cells will be transmitted simultaneously at a certain point. That is, in a condominium, a school, a company, etc., the situation where the mobile terminal 1303 is in a position where radio waves from many CSG cells reach as shown in FIG. 13 occurs. And in such a situation, there will be a mobile terminal having a white list and a mobile terminal not having a white list. In this situation, consider the case where the mobile terminal performs a cell search.

  FIG. 14 shows an example of a flowchart of cell search of a mobile terminal located at a position where radio waves from a large number of CSG cells can reach. When the mobile terminal starts cell search, it performs the operation described as a general case in FIG. In ST1401, synchronization (Physical Cell Identity) detection (identification) is performed using the first synchronization signal P-SS and the second synchronization signal S-SS. At ST1402, RS detection is performed to measure the received power of RS. In ST1403, the best cell is selected, and PBCH reception in the cell selected in ST1404 and MIB information are obtained. In ST1405, DL-SCH is received to obtain information on SIB1. Then, if the TAC information of SIB1 is the same as the TAC owned by the mobile terminal, the processing shifts to the standby operation. However, if they are not the same, they will differ from the operation shown in the general case. As described above, in such a situation, there will be mobile terminals having a white list and mobile terminals not having a white list. At ST1407, it is determined whether the mobile terminal has a white list. If the mobile terminal has a whitelist, in ST1408, it is determined whether the SIB1 TAC is the same as the CSG-ID (TAC) in the whitelist. This is because if the CSG-ID (TAC) is not the same, access to the cell is prohibited because it is not registered. If the cell is the same, the cell is registered, so access to the cell is permitted, and the process shifts to a standby operation. If different, the cell can not be accessed because it is not registered, and the process moves to ST1409. At ST1409, the mobile terminal determines whether the cell is a CSG cell. In LTE, a CSG indicator indicating whether or not the own cell is a CSG cell is included in SIB1 of broadcast information of each cell. Therefore, the determination in ST1409 can be performed using the CSG indicator included in the information on SIB1 obtained in ST1405. If the CSG indicator indicates that the cell is a CSG cell, the process proceeds to ST1410. In ST1410, the mobile terminal stores the PCI of the cell and sets so as to exclude the PCI of the cell at the time of subsequent cell search and selection of the best cell. This is because even if the cell is a CSG cell, a cell of CSG-ID (TAC) which is not on the white list of the mobile terminal. In order to store the PCI of the inaccessible CSG cell in which the mobile terminal has performed cell search and best cell selection once, an inaccessible PCI list or the like may be provided and written in the list. The PCI of the inaccessible CSG cell may be provided with a timer, and may be reset or erased when the timer period ends and / or when it is registered in a new CSG-ID. If the cell is not a CSG cell in the determination of ST1409, the process transitions to a post-TAU waiting operation because it is a non-CSG cell.

  On the other hand, when the mobile terminal does not have a white list in ST1407, the mobile terminal makes a transition to ST1409. If it is determined in ST1409 that the cell is not a CSG cell, transition is made to TAU after TAU, but if it is a CSG cell, the processing in ST1410 is similarly performed, and the cell search and the best cell selection operation are performed again. Do. The cell search and the best cell selection operation are performed again, and when the CSG cell is found, ST1407, ST1409, and ST1410 are performed again, and the cell search and the best cell selection operation are performed again. As described above, as shown in FIG. 13, the mobile terminal that does not have the whitelist in particular performs the cell search and the selection of the best cell for all the cells even though it is known that the CSG cell can not be accessed absolutely. In the case of a mobile terminal located at a position where radio waves from many Home-eNBs reach, there is a high possibility that many CSG cells are searched and the best cell is selected, and ST1401, ST1402, ST1403, ST1404, ST1405, ST1406, The operations of ST1407, ST1409, and ST1410 are repeated many times, and it takes a long time to enter the standby operation, resulting in a problem that a large control delay occurs as a system. In addition, there is a problem that the power consumption becomes huge in the mobile terminal which has to repeat the cell search. This problem occurs even if, in ST1410, the mobile terminal can not store the PCI of a CSG cell that can not be accessed, and set the cell search to exclude the PCI of the cell when selecting the best cell in the subsequent cell search. . This problem is serious when assuming the future CSG cell placement as described above.

  In order to solve such problems, in 3GPP, it is discussed to divide all PCIs (Physical Cell Identity) into CSG cells and non-CSG cells (referred to as PCI split) (non-patent document). 4). By dividing all PCIs into those for CSG cells and for non-CSG cells, mobile terminals that do not have a whitelist at the time of cell search can use P-SCH and S-SCH synchronization using PCI for non-CSG cells. Since it is sufficient to identify the PCI, it is not necessary to search for a CSG cell. However, the mobile terminal must always be aware of PCI split information before performing cell search. Therefore, in 3GPP, it is proposed that the PCI split range be fixed, that is, the range of PCI to be assigned to a CSG cell and the range of PCI to be assigned to a non-CSG cell be determined in advance. For example, PCI # 0 to # 49 are assigned to CSG cells, and PCI # 50 to # 503 are assigned to non-CSG cells in advance and described in the specification. By doing this, the mobile terminal can always recognize this value before performing cell search, and at the time of cell search, the mobile terminal that does not have a white list can be prevented from searching CSG cells in vain. It becomes possible.

  However, as described above, the method of determining in advance the PCI range to be assigned to the CSG cell and the PCI range to be assigned to the non-CSG cell is not satisfactory for the above-described request to the Home-eNB. That is, Home-eNB assumes portable size and weight, and it is required that installation and removal of these Home-eNB are performed frequently and flexibly. When considering this requirement, the number of CSG cells will differ depending on various conditions such as the operator, frequency layer, location, time of day and so on. Therefore, predetermining PCI split information causes a problem that it can not cope with the number of CSG cells that changes due to flexible and frequent installation and removal of Home-eNB.

  In order to solve this problem, a method is disclosed for notifying the mobile terminals affiliated with the PCI split information on broadcast information that is minimally received for the operation of waiting for a cell search. FIG. 15 shows a sequence diagram for broadcasting PCI split information in the communication system according to the LTE system. For example, in the communication system according to the LTE scheme, SIB1 is an example of broadcast information to be minimally received for the operation of waiting for a cell search. All base stations (Home-eNB (CSG cell) and eNB (non-CSG cell)) put PCI split information in SIB1, and map BCCH including SIB1 to DL-SCH. Then, each base station transmits DL-SCH to the mobile terminals (UEs) under its control, and broadcasts PCI split information entered in SIB1. Here, PCI split information of a frequency layer to which the own cell belongs is used as PCI split information transmitted by all base stations. Next, FIG. 16 shows a flowchart of cell search of the mobile terminal in this method. The mobile terminal initiates a cell search. First, it is determined in ST1601 whether the mobile terminal has PCI split information. For example, when power is turned on, if PCI split information is not yet obtained, the process proceeds to ST1602. The mobile terminal having transferred to ST 1602 performs the method described for the flowchart shown in FIG. 14 and performs the processing of ST 1602 to ST 1611. Here, the point different from the flowchart shown in FIG. 14 is that processing is performed to receive the PCI split information contained in SIB1 transmitted by DL-SCH in ST1606. The mobile terminal having received the PCI split information stores the PCI split information. A PCI split information list may be provided and stored in the list together with the PLMN and the frequency layer. The PCI split information stored in the list is rewritten when the broadcast information is corrected.

  The PCI split information stored in the list may be reset or erased when reselection between frequency layers is performed when the power is turned on / off, when reselection between frequency layers is performed. When the mobile terminal that has obtained the PCI split information in ST1606 proceeds to ST1611, it can use the PCI split information in ST1601 when selecting the next cell and the best cell. The mobile terminal, in ST1601, determines that it has PCI split information, and moves on to ST1612. It is determined whether the mobile terminal that has transferred to ST 1612 has a white list. If a white list is included, the process proceeds to ST1602, and the operations of ST1602 to ST1611 are performed again. However, the mobile terminal that does not have the whitelist proceeds to ST1613 and performs P-SS and S-SS synchronization using PCI of the non-CSG cell according to the PCI split information obtained in ST1606 of the first cell search. Detect (specify) PCI. The mobile terminal that has specified the PCI moves to ST1614 and performs the processing of ST1614 to ST1618. This process is the same as the process in general cell search. The important point here is that CSG cells are not searched because P-SS and S-SS synchronization is performed using PCI of non-CSG cells to detect (specify) PCIs. Therefore, even if it is known that the CSG cell can not absolutely access the CSG cell, the mobile terminal without the whitelist, which is generated by the method described in the flowchart shown in FIG. Solve the problem of repeating too.

  Furthermore, for example, when the mobile terminal that does not have the whitelist that obtained the PCI split information at the first cell search after power on performs the cell search again after that, the mobile terminal has the PCI split information, so in the determination of ST1601 "Yes", and the process proceeds to ST1612. The mobile terminal that has transferred to ST 1612 performs the processing of ST 1613 to ST 1618. Therefore, even in this case, even if it is known that the mobile terminal without the whitelist, which is generated by the method described in the flowchart shown in FIG. 14, can not access the CSG cell absolutely, the operation of ST1602 to ST1611 (except ST1609) The problem of having to repeat again and again is solved.

  Note that there are many types of broadcast information blocks. When PCI split information is put into another SIB of SIB1, it is not received in a general cell search waiting operation. Since it is necessary to receive scheduling information (allocation information) of the other SIB on SIB 1 in order to receive the other broadcast information blocks (SIB k; an integer of k ≧ 2) of the MIB and SIB 1, time is further added. This causes a delay and further increases the power consumption of the mobile terminal. By inserting the PCI split information into the broadcast information to be received at the minimum necessary for the operation of waiting from the cell search, the mobile terminal does not need to obtain another broadcast information block, and obtains the PCI split information with low power consumption in a short time. Is possible. As a system, it is possible to construct a good system with less control delay. For example, in the communication system according to the LTE scheme, MIB or SIB1 is used as broadcast information to be minimally received for the operation of waiting from cell search.

  By using the method of reporting PCI split information on SIB1 of broadcast information disclosed in the present embodiment to a mobile terminal under the control, the mobile terminal not having a white list performs the second or subsequent cell search. It becomes possible to eliminate searching for CSG cells in vain. Therefore, it takes a long time from the cell search to the standby operation to solve the problem that a large control delay occurs in the system and the problem that the power consumption of the mobile terminal becomes enormous. Therefore, it is possible to meet the demand for the installation of a large number of Home-eNBs in the future, and the demand for coping with the flexible change in the number of CSG cells caused by frequent and flexible installation and removal of Home-eNBs. It becomes possible to construct a mobile communication system.

  All cells (non-CSG cells and CSG cells) disclosed in the present embodiment broadcast the PCI split information to the affiliated mobile terminals on the broadcast information that is minimally received for the operation of waiting from cell search By using the method, it is possible to selectively search for CSG cells or non-CSG cells even in a mobile terminal having a white list. For example, when a mobile terminal having a white list preferentially accesses a CSG cell instead of a non-CSG cell, the CSG cell is preferentially used using PCI split information obtained by receiving SIB1. It is possible to cell search. In this case, the operation after ST1612 shown in FIG. 16 may be performed as follows. If it is determined in ST 1612 that the mobile terminal has a white list in ST 1612, the first synchronization signal P-SS and second synchronization signal S-SS are synchronized using PCI of the CSG cell to detect (specify) PCI. . The reference signal (RS) is detected using the identified PCI, and the received power is measured. Then, the best cell is selected by comparing the measured received power. The PBCH of the selected cell is received to receive the MIB, and the DL-SCH is received to receive the SIB1. If the tracking area code (Tracking Area Code TAC) on the SIB1 is the same as that owned by the mobile terminal, transition to the standby operation is made, and if different, the tracking area code TAC of the SIB1 in the white list owned by the mobile terminal Compare with CSG-ID (TAC). If they are the same, the operation shifts to the standby operation. If not, perform cell search again. Then, cell search is performed using the PCI of the CSG cell, and when there is no cell to be selected, an operation of performing cell search using the PCI of the non-CSG cell is started. In this way, CSG cell search can be preferentially performed, and cell search and cell selection for non-CSG cells can be performed when there are no selectable CSG cells. Become.

  Although the case where the mobile terminal having the whitelist preferentially accesses the CSG cell instead of the non-CSG cell has been described above, conversely, the access to the non-CSG cell instead of the CSG cell is described. It is also possible to give priority to When it is determined in ST 1612 that the mobile terminal has a white list, P-SS and S-SS synchronization is performed using PCI of the non-CSG cell to detect (specify) PCI. RS detection and RS reception power measurement are performed using the identified PCI. The best cell is selected by comparing the measured RS received power. The PBCH of the selected cell is received to receive the MIB, and the DL-SCH is received to receive the SIB1. If the TAC on the SIB 1 is the same as the TAC owned by the mobile terminal, the process proceeds to the standby operation, and if different, the process proceeds to the TAU after the TAU operation. Then, cell search is performed using the PCI of the non-CSG cell, and when there is no cell to be selected, an operation of performing cell search using the PCI of the CSG cell is started. In this way, it is possible to preferentially search for non-CSG cells, and when there are no selectable non-CSG cells, perform cell search and cell selection for CSG cells. It becomes possible.

  Therefore, even in a mobile terminal having a white list, it is possible to eliminate the search for unnecessary cells when performing the second and subsequent cell searches, and it takes a long time to enter the standby operation from the cell search. As a result, it is possible not only to solve the problem that a large control delay occurs as the system, and the problem that the power consumption in the mobile terminal becomes huge, but it is possible to selectively search CSG cells or non-CSG cells It becomes. As a result, a demand for installation of a large number of Home-eNBs in the future, a demand for responding to a flexible change in the number of CSG cells caused by frequent and flexible installation and removal of Home-eNBs, and For example, it is possible to construct a mobile communication system capable of responding to a mobile terminal that desires to access a registered CSG cell preferentially over a non-CSG cell, a system that wants to access it, etc.

  Although the method described above reports the PCI split information on the SIB1 of the notification information to notify the affiliated mobile terminals, the method of notifying the PCI split information on the MIB of the notification information and notifying the affiliated mobile terminals As well. FIG. 15 is applicable to the sequence diagram in the case of this method. All base stations (eNB and Home-eNB) put PCI split information in MIB, and map BCCH including MIB to PBCH. Then, all the base stations transmit PBCH to the mobile terminals (UEs) under their coverage, and broadcast PCI split information contained in MIB. Here, PCI split information transmitted by all base stations is PCI split information of the frequency layer to which the own cell belongs. In the flowchart of the cell search of the mobile terminal in this method, ST1605 and ST1606 in FIG. 16 may be modified as follows. Since the PCI split information is notified from the base station by putting it in the MIB, the mobile terminal performs the reception process of the PCI split information in ST1605. On the other hand, in ST1606, the PCI split information is not received. It becomes realizable by changing in this way. The effect described above can be obtained in the same manner by using the method of reporting PCI split information on the MIB of broadcast information and reporting to the mobile terminals under the umbrella.

  A modification of the first embodiment will be described. In the first embodiment, a method is disclosed that broadcasts information to all the cells (CSG cells and non-CSG cells on the basis of broadcast information that is minimally necessary for the operation of waiting for cell split search from the cell search) This modification 1 discloses a method of notifying the mobile terminals under the umbrella of broadcast information on which PCI split information is minimally received from the cell search only for the operation of waiting for cell search only from the CSG cell. The sequence diagram which broadcasts the PCI split information in a LTE communication system is shown.Home-eNB puts PCI split information in SIB1, maps BCCH containing SIB1 on DL-SCH, and all Home-eNB base stations are affiliated. PCI split information transmitted to the mobile terminal (UE) and placed in SIB1 Here, the PCI split information transmitted by the Home-eNB is the PCI split information of the frequency layer to which the own cell belongs, while the eNB broadcasts the PCI split information to the mobile terminals (UEs) being served thereby In the case of this modification, the mobile terminal can obtain PCI split information only when the cell selected as the cell search and the best cell selection is a CSG cell, but even in this case, the mobile terminal does not have a white list. The terminal performs many operations of ST1602 to ST1611 (except ST1609) in FIG. 16 such as cell search for CSG cells that can not be accessed from then on and selection of the best cell by selecting the CSG cell once as the best cell. It becomes possible to solve the problem of repeating.

  The effect described in the first embodiment can be obtained only by using the method in which PCI split information is carried on SIB1 or MIB of the broadcast information only from the Home-eNB disclosed in the first modification and reported to mobile terminals under the umbrella. Furthermore, it is not necessary to transmit new information (PCI split information) for CSG to broadcast information from the non-CSG cell. This eliminates the change in the LTE system (eUTRA / eUTRAN) that does not include the existing CSG and improves compatibility.

Second Embodiment
In the first embodiment, all cells (non-CSG cells and CSG cells) carry PCI (Physical Cell Identity) split information on cell information which is minimally received from cell search to standby operation. We have disclosed a way to inform. The PCI split information is PCI split information of the frequency layer to which the own cell belongs. In the second embodiment, a method is disclosed in which all base stations (eNB and Home-eNB) broadcast PCI split information of other frequency layers as broadcast information to mobile terminals affiliated. FIG. 18 shows a sequence diagram for broadcasting PCI split information of other frequency layers in the communication system according to the LTE system. All base stations (Home-eNB and eNB) include, in broadcast information (BCCH), PCI split information of another frequency layer different from the frequency layer to which the own cell belongs. Then, all the base stations notify the broadcast information to the mobile terminals (UEs) served thereby. Therefore, the mobile terminal under the umbrella can obtain the PCI split information of the other frequency layer from the broadcast information from the serving cell. For this reason, the mobile terminal may use the PCI split information of the other frequency layer when it needs to process the other frequency layer, such as cell search, cell selection, cell reselection, handover, etc. It becomes possible. Since PCI split information of other frequency layers can be used, for example, when performing cell search or cell selection between frequency layers, PCI split information of a desired frequency layer is used from the first cell search of the operation and cell selection. It becomes possible. A mobile terminal that does not have a white list can be prevented from searching for CSG cells that can not be accessed when performing cell search. For this reason, it takes a long time from the cell search to other frequency layers to start the standby operation, causing a large control delay as a system, and a huge amount of power consumption in the mobile terminal. You can solve the problem. Therefore, it is possible to meet the demand for the installation of a large number of Home-eNBs in the future, and the demand for coping with the flexible change in the number of CSG cells caused by frequent and flexible installation and removal of Home-eNBs. It becomes possible to construct a mobile communication system. The number of other frequency layers may be one or more. In that case, the mobile terminal may store PCI split information, the priority order of the frequency, etc. in pairs (for example, it may be stored as a list).

  In the second embodiment, the broadcast information (BCCH) includes PCI split information of another frequency layer different from the frequency layer to which the own cell belongs. Specifically, it may be added to SIB5, which is a broadcast information block on which broadcast information of a frequency layer different from the own cell is currently being discussed in 3GPP. A base station maps BCCH containing SIB5 on which the alerting | reporting information of a frequency layer different from an own cell is carried on DL-SCH, and transmits DL-SCH to an affiliated mobile terminal (UE). The mobile terminal receives the SIB5, thereby using the PCI split information of the other frequency layer in the SIB5 in the case of cell search to another frequency layer, cell selection, etc., thereby reducing power consumption in a short time. It is possible to perform cell search to other frequency layers, cell selection, and the like.

  Further, PCI split information of another frequency layer different from the frequency layer to which the own cell belongs may be transmitted as individual information. For example, the cell may include PCI split information of another frequency layer different from the frequency layer to which the own cell belongs, in the dedicated control information (DCCH), and transmit it individually to the mobile terminals being served thereby. Also, a mobile terminal under a certain cell may transmit a request message individually requesting the cell to transmit the PCI split information as individual information. Also, for example, the cell may transmit PCI split information of another frequency layer different from the frequency layer to which the own cell belongs to paging information (PCCH) individually for the mobile terminals being served thereby. By doing this, each cell can transmit PCI split information of another frequency layer different from the frequency layer to which the own cell belongs, as needed, so that the utilization efficiency of radio resources can be improved. it can.

  In the first and second embodiments, PCI split information is transmitted from the non-CSG cell or CSG cell to the mobile terminal. The PCI split information may be generated in the core network and transmitted to the mobile terminal via a non-CSG cell or a CSG cell. Even in this case, the same effects as described above can be obtained.

  In the first and second embodiments, a Long Term Evolution (LTE) communication system and a Universal Mobile Telecommunications System (UMTS) using Home-eNB and Home-NB in which a Closed Subscriber Group Cell (CSG) is used have been described. The present invention is also applicable to UMTS using Home-NBs where CSG is not used. The PCI may be divided by the Home-NB and the other NBs, and PCI split information may be included in broadcast information from all the base stations (NB and Home-NB) as PCI split information and broadcast to the mobile terminals under the umbrella. Among the broadcast information, the broadcast information block necessary for cell search and cell selection may be included in the PCI split information and broadcast to the affiliated mobile terminals. As a result, mobile terminals not registered in Home-NB will not perform unnecessary cell search and cell selection, and it will take a long time to enter standby mode from cell search, resulting in a large control delay for the system. It is possible to solve the problem of the occurrence of the problem and the problem that the power consumption in the mobile terminal becomes enormous. Therefore, it is possible to construct a mobile communication system that can meet the requirements for the case where there are a large number of Home-NBs installed in the future, and when the Home-NBs have been installed and removed frequently and flexibly. Become.

Third Embodiment
Responding to the need for the installation of a large number of closed subscriber group (CSG) cells in the future, and the need to respond to the flexible change in the number of CSG cells caused by the frequent and flexible installation and removal of CSG cells. In order to construct a mobile communication system, the first and second embodiments disclose a method of transmitting and receiving PCI split information. In this embodiment, a problem in whitelist operation caused by installation of a large number of CSG cells and frequent and flexible installation and removal of CSG cells is described, and the problems are eliminated. Disclose the method.

  At present, in 3GPP, a method of obtaining a whitelist in the case where a mobile terminal registers in a CSG cell in an LTE system is being discussed (Non-Patent Document 5). In 3GPP, it is agreed that the mobile terminal is notified of the whitelist via the non-CSG cell. FIG. 19 shows a case where a Home-eNB (CSG cell) exists in an area of an eNB (non-CSG cell). The mobile terminal (UE) is in the area of the CSG cell. Although there are one CSG cell in the non-CSG cell in the figure, multiple CSG cells may exist. The following describes how to obtain a whitelist in such a situation. First, the owner of the Home-eNB notifies the network operator that the mobile terminal (UE) owned by the user has been registered for user access. Thereafter, the network operator notifies the mobile terminal (UE) of the whitelist from the upper layer. Notification of the white list is performed via an eNB (non-CSG cell).

  FIG. 20 shows a sequence diagram of a method of notifying a whitelist via a non-CSG cell, which is discussed in 3GPP. The figure shows the case of the communication system of the LTE system, where "Owner" is the owner of the Home-eNB, and "CN" is the core network (MME, base station controller). The core network includes MME and the like. When the user registers the mobile terminal to the Home-eNB for user access, the owner of the Home-eNB notifies the network operator that the mobile terminal (UE) owned by the user is registered for user access to the Home-eNB in ST2001. For example, the identification number of the mobile terminal (UE-ID, identification information of the mobile terminal such as IMSI) is transmitted to the core network. The network operator that has received the identification number (UE-ID, IMSI, etc.) of the mobile terminal transmitted from the owner is the home network from the core network so that the mobile terminal can access the Home-eNB in ST2002. Send an access grant configuration request to the eNB. The Home-eNB that has received the access permission setting request performs setting for permitting access from the mobile terminal in ST2003. Next, in ST 2004, the network operator transmits a whitelist from the core network to the eNB of the non-CSG cell in which the Home-eNB is present. The eNB that has received the whitelist in ST2005 notifies the mobile terminal of the whitelist. The mobile terminal notified of the whitelist in ST2006 stores the whitelist in its own mobile terminal. Specifically, storage in SIM / USIM (which may be a storage device such as a memory or a CPU) has been proposed.

  Mobile terminals that do not have a whitelist can not access CSG cells, and can access only non-CSG cells. On the other hand, the mobile terminal having the whitelist can access the CSG cell of the registered CSG-ID as well as the non-CSG cell.

  The method of acquiring the whitelist when the mobile terminal registers in the CSG cell, which has been discussed in 3GPP, has been described above. However, in this method, the mobile terminal receives the whitelist via an eNB (non-CSG cell). This becomes a requisite condition that the mobile terminal is under the umbrella of the non-CSG cell. That is, when the mobile terminal is not affiliated with a non-CSG cell, there arises a problem that it becomes impossible to obtain a whitelist.

  FIG. 21 shows a case where the Home-eNB (CSG cell) registered by the mobile terminal is out of the area of the non-CSG cell. The mobile terminal can not communicate with the non-CSG cell because it is not under the control of the non-CSG cell. Therefore, the mobile terminal can not obtain the whitelist even if it registers in the CSG cell. Mobile terminals that do not have a whitelist are not permitted to access the CSG cell, and thus can not access the registered CSG cell. Therefore, although the mobile terminal which does not have the whitelist is under the umbrella of the CSG cell which has registered for user access, it can not perform cell search or cell selection to the CSG cell. In order to solve this problem, 3GPP proposes that a mobile terminal outside the area of a non-CSG cell that has performed user access registration with a CSG cell activate manual search (Non-Patent Document 5). In Non-Patent Document 5, a mobile terminal outside the area of non-CSG cell which has performed user access registration in the CSG cell does not yet have the whitelist but is in the area of the CSG cell in which the user access is registered. In this case, it is described that TAU is transmitted to the core network via the CSG cell that has performed user access registration to obtain a white list by activating a manual search.

  However, in the proposal by 3GPP, a specific method of this manual search is not shown. There is no mention of how to allow TAU to be transmitted to the core network via the CSG cell. Here, the disclosure of the specific method makes it possible to obtain a whitelist from a CSG cell when a mobile terminal that does not have the whitelist performs user access registration in the CSG cell. FIG. 22 discloses a specific sequence diagram in the case where, for example, a mobile terminal having no white list activates a manual search in a communication system according to LTE. When the user registers the mobile terminal in the CSG cell (here, Home-eNB) for user access, in ST 2201 the network operator of the CSG cell registers the mobile terminal (UE) owned by the user in the CSG cell. For example, the mobile terminal's identification number (UE-ID, IMSI, etc.) is sent to the core network to notify that it has been sent. The network operator that has received the identification number (UE-ID, IMSI, etc.) of the mobile terminal transmitted from the owner is the CSG cell from the core network so that the mobile terminal can access the CSG cell in ST 2202 Send access permission setting request. The CSG cell that has received the access permission setting request performs setting for permitting access from the mobile terminal in ST2203.

  Next, in ST 2204, the mobile terminal that has performed user access registration in the CSG cell starts manual search of the CSG cell. In this manual search of CSG cells, mobile terminals that do not have a whitelist are permitted to access CSG cells for which user access has been registered. By doing this, the mobile terminal under the umbrella of the CSG cell for which user access registration has been performed can perform cell search for the CSG cell and perform cell selection. The mobile terminal which has selected the CSG cell receives a TAC (Tracking Area Code) transmitted from the CSG cell, and compares it with the TAC held in the own mobile terminal. Since the mobile terminal does not have a whitelist, the TAC held in its own mobile terminal will be different from the TAC transmitted from the CSG cell. Conventionally, when the TAC differs in this way, the mobile terminal is not allowed to establish an RRC connection to the CSG cell. Then, access to the CSG cell becomes impossible, and it becomes impossible to transmit TAU to the core network via the CSG cell. Therefore, the whitelist can not be obtained. However, in the method disclosed in the present embodiment, at the time of manual search activation for obtaining the whitelist, even when the TAC is different, a request for RRC connection to the CSG cell to which the mobile terminal has registered for user access, and further , TAU (Tracking Area Update) request can be made. The mobile terminal that has activated manual search in ST2204 and has selected the CSG cell transmits a request for RRC connection to the CSG cell. The CSG cell that has received the RRC connection request from the mobile terminal permits establishment of the RRC connection because the mobile terminal is set to be permitted to access in ST2203. The mobile terminal permitted to establish the RRC connection transmits a TAU request to the CSG cell in ST2205. The TAU request message may be sent together with a number (UE-ID, IMSI, etc.) for identifying the mobile terminal. The CSG cell that has received the TAU request transmits the TAU request to the core network together with the number identifying the mobile terminal in ST 2206 because the mobile terminal is set to be permitted to access. In ST2207, the core network checks whether the mobile terminal that has transmitted the TAU is a mobile terminal registered in the CSG cell. Specifically, the core network has a list of mobile terminal identification numbers for which user access is permitted for each TAC or CSG-ID, and the mobile terminal identification numbers registered for user access in ST 2201 in the list. Rewrite (or delete or add). The process of ST2207 is performed by, for example, the MME 73. For example, it is performed by the idle state mobility management unit 1005-3 of the MME 73 illustrated in FIG.

  In ST2207, the core network can determine whether the mobile terminal that has transmitted TAU (Tracking Area Update) is a mobile terminal registered in the CSG cell by using the list. The core network that has determined that the mobile terminal that has transmitted the TAU in ST 2207 is the mobile terminal that has registered in the CSG cell transmits a TAU accept message to the CSG cell in ST 2208. The CSG cell that has received the TAU accept message transmits a TAU accept message to the mobile terminal in ST2209. Furthermore, the core network transmits a whitelist to the CSG cell in ST 2210, and the CSG cell that has received it transmits the whitelist to the mobile terminal in ST 2211. The mobile terminal notified of the white list in ST 2212 stores the white list in its own mobile terminal. Specifically, it is proposed to be stored in SIM / USIM. Here, although the white list is described to be transmitted, it may not be the white list itself, but may be the CSG information of the CSG cell which the mobile terminal has registered for user access, which is described in the white list. Specifically as CSG information, CSG-ID, TAI, TAC etc. can be considered. As long as CSG-ID and TAI or TAC are corresponded, any one may be used.

  In addition, GCI may be used if CSG-ID or TAI or TAC and GCI (Global Cell Identity) are associated. Also, it may be a message requesting that the mobile terminal write the TAC or CSG-ID information on the BCCH received in a series of processing of cell search and cell selection into the white list, not the white list itself. The mobile terminal notified of the whitelist in ST 2211 stores (registers) the whitelist in its own mobile terminal in ST 2212. When the CSG-ID is notified instead of the white list in ST2211, the CSG-ID is stored in the white list. In addition, when it is requested to write the TAC or CSG-ID information on the BCCH to the white list, the TAC or CSG-ID information is stored in the white list. The mobile terminal which has registered the whitelist in ST 2212 can access the CSG cell without being limited to the case where the manual search is activated. The CSG cell described here may be any CSG cell as long as the CSG cell belongs to the same CSG-ID. Further, the method disclosed in the present embodiment can also be applied to the case where a mobile terminal that already has a whitelist changes (deletes, adds) the whitelist.

  By setting the method of manual search when a mobile terminal without a white list performs user access registration to a CSG cell as in the sequence shown in FIG. 22, even if the mobile terminal is under the umbrella of a non-CSG cell. Even if not present, the whitelist can be obtained from the CSG cell. The Home-eNB manual search proposed in 3GPP is that, as shown in FIG. 21, a mobile terminal without a whitelist can select a CSG cell at the time of a manual search under the umbrella of a CSG cell for which user access is registered. Is assumed. Therefore, the mobile terminal can set up an RRC connection, which could not be achieved conventionally, and can request a TAU (Tracking Area Update) only for the CSG cell belonging to the CSG-ID of the CSG cell for which user access registration has been performed. If so, manual search allows the mobile terminal to access the CSG cell and obtain a white list.

Fourth Embodiment
In the future, if the installation of a large number of CSG cells and the installation and removal of CSG cells are performed frequently and flexibly, it may not be possible to obtain a whitelist only by the method disclosed in the third embodiment. It will occur. FIG. 23 shows the case where the mobile terminal is not under the control of a non-CSG cell but under the control of a large number of CSG cells. The situation shown in the figure may occur when many CSG cells are installed in apartments, schools, companies, etc. in the future. As a method of operating a CSG cell, it is considered to promote installation in a place where radio waves from such non-CSG cell do not reach and to enable communication via the CSG cell.

  For example, at present, there are many situations where the room of the apartment does not reach radio waves from non-CSG cells. In such a case, a CSG cell is installed in each room, a CSG is configured for each room, and a CSG-ID is given. For example, a case may be considered where mobile terminals owned by residents of each room register with the CSG of each room for user access. In such a situation, as shown in FIG. 23, the mobile terminal does not reach the radio waves from the non-CSG cell, but exists in a place where the radio waves from many CSG cells can reach. Also, in such a case, depending on the radio wave propagation environment, the radio waves from the CSG cell for which user access is registered may not reach the mobile terminal, or the received power may be weaker than other CSG cells even if they arrive. Do. Under such circumstances, the mobile terminal can not select a CSG cell for which user access has been registered.

  According to the above-mentioned proposal in 3GPP (non-patent document 5), when the mobile terminal that has performed user access registration in the CSG cell does not yet have a whitelist and is in the area of the CSG cell that has registered for user access, Although it is described that TAU is transmitted to the core network via the CSG cell for which user access registration has been performed by activating manual search, a CSG cell (the same CSG-ID for which the mobile terminal has registered for user access) There is no mention of the case where it is not possible to select the CSG cell of (1), and no mention is made of the case where the TAU is rejected. Therefore, in a situation where the mobile terminal can not select a CSG cell for which user access registration has been made, it becomes impossible to obtain a whitelist by the method proposed in 3GPP (Non-Patent Document 5) The problem arises that

  Furthermore, the following problems occur not only when a mobile terminal that does not have a whitelist registers a whitelist, but also when a mobile terminal that already has a whitelist changes (deletes, adds) the whitelist. . The proposal in 3GPP mentioned above does not make any description about the mobile terminal having a white list. Even in a mobile terminal having a white list, in the situation as shown in FIG. 23, a CSG cell (cell which is not a suitable cell) having a CSG-ID different from that of the CSG cell in which the mobile terminal has registered for user access is selected. You may Also in this case, there is no description about the case where the mobile terminal can not select the CSG cell (including the CSG cell of the same CSG-ID) for which the user access is registered, and the case where the TAU is rejected. The method proposed in 3GPP (Non-Patent Document 5), which is not described at all, causes a problem that it becomes impossible to obtain a whitelist. The discussion in 3GPP does not suggest any of these problems, and no solution to these problems has been suggested.

  In order to solve these problems, in the present embodiment, when a mobile terminal that has performed user access registration (hereinafter, includes change (including deletion and addition)) in the CSG cell performs manual search, whether there is a white list or not Regardless of the CSG cell belonging to the CSG cell of the CSG cell that has performed user access registration, establishment of an RRC connection and TAU transmission to the core network via the CSG cell are enabled not only to the CSG cell but also to the mobile terminal Discloses a method for enabling TAU transmission to the core network via a selected CSG cell no matter which CSG cell is selected.

  In FIG. 24, when RRC connection can be established not only to CSG cells belonging to the CSG-ID of the CSG cell that has performed user access registration but also to other CSG cells, and TAU can be transmitted to the network via the CSG cell Shows a sequence diagram when performing a manual search. The figure shows, for example, an LTE communication system using a Home-eNB. The figure will be described. Here, although the mobile terminal performs user access registration to Home-eNB (C), the operation from ST 2401 to ST 2403 is the same as that described above, and therefore, the description is omitted. The mobile terminal in the situation as shown in FIG. 23 starts a manual search of Home-eNB in ST2404 at the time of registration and change of the whitelist. The mobile terminal that has started the manual search performs cell search and cell selection in ST2405. In the case as shown in FIG. 23, the mobile terminal selects a CSG cell. Whether or not the selected CSG cell is a CSG cell that has performed user access registration, the mobile terminal enables establishment of an RRC connection to the CSG cell, and enables TAU transmission to the network via the CSG cell. . Therefore, the mobile terminal transmits a request for RRC connection to a CSG cell (here, Home-eNB (A)) which is not a CSG cell (here, Home-eNB (C)) for which user access registration was performed in ST 2406. The Home-eNB (A) that has received the connection establishment request transmits the establishment permission to the establishment request to the mobile terminal, thereby establishing an RRC connection between the mobile terminal and the Home-eNB (A). Next, in ST2407 and ST2408, the mobile terminal is allowed to transmit a TAU request message to the core network via a CSG cell (Home-eNB (A)) which is not a CSG cell for which user access registration has been performed. Here, the mobile terminal also transmits a mobile terminal identification number. The mobile terminal identification number may be included in the TAU request message, may be included with the TAU request message, or may be transmitted as a separate message. Also, a CSG cell that is not a CSG cell for which user access is registered can manually distinguish the RRC connection request message from the mobile terminal and the TAU request message so that it can be distinguished from the start of manual search and other cases. Information indicating that the search is activated may be included. As a result, a CSG cell that is not a CSG cell that has registered for user access is limited to the establishment of an RRC connection with the mobile terminal, the reception of a TAU request message from the mobile terminal, and the core network Transmission and reception of a series of messages such as transmission can be enabled.

  The core network that has received the TAU request message checks whether the mobile terminal belongs to the CSG-ID of the Home-eNB (A) based on the received mobile terminal identification number. As the method of this check, the method described in ST2207 disclosed in FIG. 22 can be applied. Since the mobile terminal identification number is not registered in the CSG-ID to which the Home-eNB (A) belongs, the core network determined to be inaccessible to the Home-eNB (A) is Home-eNB in ST 2410 and ST 2411. A TAU reject message for the TAU request is transmitted to the mobile terminal via the eNB (A). The mobile terminal that has received the TAU reject message releases an RRC connection with the Home-eNB (A) in ST 2412. Then, in ST 2413, the mobile terminal performs cell selection again. Here, cell selection may be performed after performing cell search again. At the time of cell selection again after receiving the TAU reject message, the Best cell may be reselected except for the Home-eNB (A) that transmitted the TAU reject message, or the Home-eNB that transmitted the TAU reject message The best cell may be reselected including (A). Even when the Best cell is selected again including the Home-eNB (A) that has transmitted the TAU reject message, another cell search environment is performed by performing cell selection after performing cell search again, and so on. It also happens when a cell is the best cell and another cell is selected.

  The mobile terminal that has selected the Home-eNB (B) in the cell selection again is permitted to establish an RRC connection to a CSG cell not registered for user access, and is allowed to transmit a TAU to the network via the CSG cell. Therefore, in ST 2414, RRC connection establishment processing is transmitted, and in ST 2415 and ST 2416, a TAU request message is transmitted to the core network. However, since the mobile terminal identification number is not registered in CSG-ID to which Home-eNB (B) belongs in ST 2417 as in ST 2409, the core determined to be inaccessible to Home-eNB (B) The network, in ST2418 and ST2419, transmits a TAU reject message for the TAU request to the mobile terminal via the Home-eNB (B). The mobile terminal that has received the TAU reject message releases an RRC connection with the Home-eNB (B) in ST2420. Then, in ST24121, the mobile terminal performs cell selection again as in ST2413. The mobile terminal that has selected the Home-eNB (C) in the cell selection again performs RRC connection establishment request to the CSG cell regardless of whether or not user access registration is performed, and TAU to the network through the CSG cell. In ST2422, an RRC connection establishment process is transmitted, and in ST2423 and ST2424, a TAU request message is transmitted to the core network. In ST2425, since the mobile terminal identification number is registered in CSG-ID to which Home-eNB (C) belongs, the core network determines that Home-eNB (C) is accessible, and in ST2426 and ST2427, Home Send a TAU accept message for the TAU request to the mobile terminal via eNB (C). Also, in ST2428, the core network transmits a whitelist to the Home-eNB (C). Home-eNB (C) which received the whitelist transmits a whitelist with respect to this mobile terminal in ST2429. The mobile terminal to which the whitelist has been transmitted in ST 4730 stores the whitelist in its own mobile terminal.

  By adopting such a method, in the manual search of the mobile terminal, even if the CSG cell for which user access registration is performed is not selected in the first cell selection, the white list can not be unavailable, and what is the problem? In the second cell selection, a CSG cell with user access registration is selected, and the mobile terminal can obtain a whitelist from the core network through the CSG cell with user access registration. .

  As disclosed in the present embodiment, when the mobile terminal performs a manual search, regardless of the presence or absence of the whitelist, the CSG cell belonging to the CSG-ID of the CSG cell which has performed user access registration is not limited to the other CSG cells. Also enables establishment of RRC connection and TAU transmission to the core network via CSG cell in the cell, and enables TAU to be transmitted to the core network via selected CSG cell even if the mobile terminal selects any CSG cell By using this method, it is possible to solve the above-mentioned problem that it becomes impossible to obtain the whitelist under the situation where the mobile terminal can not select the CSG cell registered for user access. Become. Also, even when a mobile terminal that already has a whitelist changes (deletes, adds) the whitelist, it selects a CSG cell whose CSG-ID is different from that of the CSG cell that the mobile terminal has registered for user access. In such a situation, it is possible to solve the problem that it becomes impossible to obtain a whitelist. This makes it possible to cope with system requirements where installation of a large number of CSG cells in the future, and installation and removal of CSG cells are performed frequently and flexibly.

Embodiment 5
By performing the method disclosed in the fourth embodiment, it is possible to solve the problem that it becomes impossible to obtain a whitelist under the situation where it is not possible to select a CSG cell for which the mobile terminal has registered for user access. It will be possible. The present embodiment further discloses a method that enables effective communication even when there are CSG cells belonging to CSG-IDs not registered for a large number of user access.

  In the situation as shown in FIG. 23, when there are a large number of CSG cells belonging to CSG-IDs for which the mobile terminal has not registered for user access, cell search or a cell search is performed when the mobile terminal performs a manual search. In cell selection, and further in cell search and cell selection again, a situation occurs in which CSG cells for which the mobile terminal has not been registered for user access continue to be selected for a long time. In such a situation, the mobile terminal repeatedly establishes a RRC connection for a large number of CSG cells, and repeats a TAU request to the core network via the CSG cell. In the future system operation, it is assumed that a large number of mobile terminals as described above exist. For example, a CSG cell may be installed in each classroom of the school, and students in each classroom may register or change the whitelist. In such a case, the mobile terminal repeatedly sets up an RRC connection to a large number of CSG cells from more mobile terminals, and repeatedly requests TAU to the core network via the CSG cell. The number is expected to be huge. In such a situation, there arises a problem that the system causes an extreme decrease in the utilization efficiency of radio resources and the signaling efficiency. Furthermore, it takes a long time from the cell search to the standby operation, causing a problem that a large control delay occurs in the system, and a problem that the power consumption of the mobile terminal becomes enormous.

  In addition, the white list possessed by the mobile terminal may be rewritten for some reason, or the mobile terminal erroneously receives the content of the white list transmitted from the core network when registering or changing the white list. The following problems also occur. For example, a case will be described where the mobile terminal mistakenly receives the content of the whitelist transmitted from the core network when registering or changing the whitelist. As shown in FIG. 23, in the situation where there are a large number of CSG cells, there may be a case where CSG cells belonging to the CSG-ID of the whitelist received in error are selected. Also in such a case, the mobile terminal may repeatedly set up an RRC connection to the CSG cell belonging to the wrong whitelist CSG-ID or repeatedly request TAU to the core network via the CSG cell. Become.

  In order to solve these problems, in this embodiment, in addition to the method of the fourth embodiment, when the mobile terminal performs a manual search, the CSG-ID of the CSG cell to which the mobile terminal has registered for user access Even if the RRC connection is established in a CSG cell different from the CSG cell belonging to C, and the TAU request is further transmitted to the core network via the CSG cell, the core network transmits a TAU reject message to the mobile terminal via the CSG cell. Discloses a method of transmitting a whitelist via the CSG cell prior to transmitting FIG. 25 shows a sequence diagram of a method of transmitting a whitelist before transmitting a TAU reject. The figure will be described. The figure shows, for example, an LTE system using a Home-eNB. Here, although the mobile terminal performs user access registration to Home-eNB (C), the operation from ST 2501 to ST 2503 is the same as that described above, and therefore, the description is omitted. The mobile terminal that has started the manual search of the CSG cell (here, Home-eNB) in ST2504 performs cell search and cell selection in ST2505.

  In the situation as shown in FIG. 23, when there are a large number of CSG cells belonging to CSG-IDs for which the mobile terminal has not registered for user access, the mobile terminal selects a CSG cell. As disclosed in the fourth embodiment, the mobile terminal enables establishment of an RRC connection to the CSG cell regardless of whether the cell-selected CSG cell is a CSG cell for which user access registration has been performed or not, and the CSG cell is Enables TAU to be sent to the network via By this means, the mobile terminal transmits an RRC connection request to a CSG cell (here, Home-eNB (A)) that is not a CSG cell (here, Home-eNB (C)) for which user access registration was performed in ST2506. The Home-eNB (A) that has received the RRC connection establishment request transmits the establishment permission to the establishment request to the mobile terminal to establish an RRC connection between the mobile terminal and the Home-eNB (A). . Next, in ST2507 and ST2508, the mobile terminal is allowed to transmit a TAU request message to the core network via a CSG cell (Home-eNB (A)) that is not a CSG cell for which user access registration has been performed. Here, the mobile terminal also transmits a mobile terminal identification number. The mobile terminal identification number may be included in the TAU request message, may be included with the TAU request message, or may be transmitted as a separate message. Also, a CSG cell that is not a CSG cell for which user access is registered can manually distinguish the RRC connection request message from the mobile terminal and the TAU request message so that it can be distinguished from the start of manual search and other cases. Information indicating that the search is activated may be included. As a result, a CSG cell that is not a CSG cell that has registered for user access is limited to the establishment of an RRC connection with the mobile terminal, the reception of a TAU request message from the mobile terminal, and the core network Transmission and reception of a series of messages such as transmission can be enabled. The core network that has received the TAU request message checks whether the mobile terminal belongs to the CSG-ID of the Home-eNB (A) based on the received mobile terminal identification number. As the method of this check, the method described in ST2207 disclosed in FIG. 22 can be applied. Since the mobile terminal identification number is not registered in the CSG-ID to which the Home-eNB (A) belongs, the core network determines that the mobile terminal can not access the Home-eNB (A).

  In the method disclosed in the fifth embodiment, even if it is determined that the mobile terminal can not access the Home-eNB (A) in the core network, the Home-eNB (in ST 2510) transmits the TAU reject. Send the white list of the mobile terminal to A). Home-eNB (A) which received the whitelist of this mobile terminal transmits a whitelist with respect to this mobile terminal by ST2511. The mobile terminal to which the whitelist has been transmitted in ST5212 stores the whitelist in its own mobile terminal. The core network that has transmitted the white list of the mobile terminal to the Home-eNB (A) in ST 2510 is a TAU reject message for the TAU request via the Home-eNB (A) in ST 2513 and ST 2514 to the mobile terminal. Send. The mobile terminal that has received the TAU reject message releases an RRC connection with the Home-eNB (A) in ST 2515.

  By adopting such a method, in the manual search of the mobile terminal, the CSG cell for which user access registration has been continuously made in cell selection will not be deselected, and in the first cell selection, the mobile terminal accesses the user It becomes possible to obtain a whitelist from the core network through a non-registered CSG cell. Also, even if only the selection of the best cell is permitted in cell selection, using this method makes it possible to reliably obtain a whitelist from the selected best cell.

  As a method of manual search, not only cell search and activation before cell selection but also cell identification number of one or more cells suitable for cell search selection criteria in cell search, or TAC, or CSG-ID etc. It may be displayed, and the user of the mobile terminal may manually select a desired cell from the one or more cells to establish an RRC connection and transmit a TAU request to the desired cell. If the CSG cell in which the mobile terminal has registered for user access is manually selected as the desired cell, it is necessary to transmit and receive a TAU request message and transmit / receive a CSG cell in which the mobile terminal has not registered for user access. There is no

  However, to receive the cell identification number of a cell, or TAC, or CSG-ID, etc., it takes time because broadcast information such as SIB1 from the cell needs to be received as shown by ST1205 in FIG. I will. In a situation where a large number of CSG cells are installed, it is conceivable that in the cell search, a large number of cells may be suitable for the cell search selection criteria, the broadcast information of all the cells is received, and the cell identification number, Alternatively, displaying the TAC, CSG-ID, etc. on the mobile terminal also takes an enormous amount of time. Also, when the mobile terminal performs cell search for a CSG cell suitable for cell search selection criteria, resolution for separating the CSG, storage of broadcast information of the CSG cell, and the like are required. In a situation where a large number of CSG cells are installed, it is possible that in the cell search, a large number of cells are suitable for the cell search selection criteria, resolution for receiving all the cells, and all the cells. Storing the received broadcast information complicates the reception unit of the mobile terminal, and it is necessary to provide a storage processing unit of a huge storage capacity in the mobile terminal. Therefore, the size of the mobile terminal is increased and the manufacturing cost is increased. In order to avoid such a problem, in the cell search process, a method of limiting the search time or limiting the number of cells to be searched is used. For example, a method of selecting a best cell within a certain time limit or from a certain limited number of cells.

  When such a method is used, the mobile terminal is made to display the cell identification number of one or more cells suitable for cell search selection criteria in cell search, or TAC, or CSG-ID, etc. Among them, in a method in which a mobile terminal manually selects a CSG cell for which user access registration has been made, the CSG cell can not be searched within the search time limit, and the cell to be searched is restricted, There is a problem that the CSG cell may not enter. In such a case, no matter how much manual search is performed, the mobile terminal can not select a CSG cell for which user access registration has been made, resulting in the problem that it is impossible to obtain a white list.

  It is possible to solve the above problem by applying the present embodiment also in such a case. When a mobile terminal that has performed user access registration (hereinafter, including change (including deletion and addition)) in the CSG cell performs a manual search, the CSG of the CSG cell of the CSG cell that performed the user access registration regardless of the presence or absence of the whitelist. Not only the CSG cell belonging to the ID but also other CSG cells can establish RRC connection and transmit TAU to the core network via the CSG cell, and the CSG cell selected even if the mobile terminal selects any CSG cell By enabling TAU to be transmitted to the core network via the CSG cell, the CSG cell can not be searched within the search time limit in the cell search, and the cell to be searched is restricted, and the CSG cell is included therein. Even if it does not come back to the other CSG cell by selecting the other CSG cell Then, establishment of RRC connection and TAU transmission to the core network through the CSG cell becomes possible, and the core network transmits the TAU reject message through the CSG cell to the mobile terminal through the CSG cell. It becomes possible to transmit the whitelist, and the mobile terminal can obtain the whitelist.

  By adopting the method disclosed in the present embodiment, a huge number of CSG cells belonging to CSG-IDs for which the mobile terminal has not registered for user access exist, or a mobile terminal in such a situation If there is a large number of such cases, the white list possessed by the mobile terminal may be rewritten for some reason, or the mobile terminal erroneously displays the content of the white list transmitted from the core network when registering or changing the white list. If it has been received, when the mobile terminal performs a manual search, a situation occurs in which CSG cells continue to be selected endlessly, and the mobile terminal establishes an RRC connection to a large number of CSG cells, or CSG It is possible to eliminate the problem of repeating the TAU request to the core network in vain through the cell. By solving these problems, it is possible to eliminate an extreme decrease in radio resource usage efficiency and signaling efficiency in future system operation. Furthermore, the time from the cell search to the standby operation can be shortened, and the problem that a large control delay occurs as the system can be solved. Furthermore, when manual search is performed in the mobile terminal, a situation in which CSG cells are continuously selected can be resolved, and therefore, power consumption of the mobile terminal can be reduced.

  Hereinafter, a modification of the fifth embodiment described above will be described. In the fifth embodiment, in addition to the method of the fourth embodiment, when the mobile terminal performs a manual search, the CSG cell is different from the CSG cell belonging to the CSG-ID of the CSG cell for which the mobile terminal has registered for user access. Even when the RRC connection is established and the TAU request is transmitted to the core network via the CSG cell, the core network transmits the TAU reject message to the mobile terminal via the CSG cell before the CSG cell is transmitted. Disclosed a method of sending a whitelist via. In this modification, when transmitting a TAU reject message to the mobile terminal via the CSG cell, the core network discloses a method of transmitting a white list on the TAU reject message.

  FIG. 26 shows a sequence diagram of the method disclosed in the first modification. Since this method is almost the same as the method described in FIG. 25 of the fifth embodiment, only different parts will be described here. The core network for which it was checked in ST 2609 whether the mobile terminal belongs to the CSG-ID of the Home-eNB (A) based on the received mobile terminal identification number is the Home-eNB It is determined that A) is inaccessible. In ST 2610, the core network transmits a TAU reject message including a request for white list notification to the Home-eNB (A). Home-eNB (A) which received this message transmits a TAU reject message including the notification of a white list with respect to this mobile terminal by ST2611. The mobile terminal that has received the TAU reject message including the notification of the white list in ST2611 stores the white list in its own mobile terminal in ST2612. Moreover, the RRC connection between this mobile terminal and Home-eNB (A) is released by ST2613. With such a method, in addition to the effects of the fifth embodiment, it is possible to reduce the signaling for whitelist transmission performed before the core network transmits a TAU reject message to the mobile terminal via the CSG cell. It becomes possible. Furthermore, since the TAU request message is sent and received with the TAU request message, the effect of improving the compatibility with the conventional TAU request and reject method is obtained.

Sixth Embodiment
In order to solve the problems described in the fifth embodiment, in the present embodiment, when the mobile terminal receives the TAU reject message continuously from the same cell n times (an integer of n 整数 1), the mobile terminal Discloses the establishment of an RRC connection to the cell and a method of inhibiting the transmission of a TAU request message.

  FIG. 27 shows a sequence diagram of a method in which the mobile terminal prohibits establishment of an RRC connection to the cell when receiving a TAU reject message from the same cell once. The figure will be described. The figure shows, for example, the case of an LTE system using a Home-eNB. Here, it is assumed that the mobile terminal performs user access registration in Home-eNB (B), but the operation from ST 2701 to ST 2703 is the same as that described above, and therefore the description is omitted. The mobile terminal that has started the manual search of the CSG cell (here, Home-eNB) in ST2704 performs cell search and cell selection in ST2705. In the situation as shown in FIG. 23, when there are a huge number of CSG cells belonging to CSG-IDs for which the mobile terminal has not been registered for user access, the CSG-ID for which the mobile terminal has not been registered for user access Cell selection of the belonging CSG cell is often performed. As disclosed in the fourth embodiment, the mobile terminal enables establishment of an RRC connection to the CSG cell regardless of whether the cell-selected CSG cell is a CSG cell for which user access registration has been performed or not, and the CSG cell is Enables TAU to be sent to the network via Thereby, in ST 2706, the mobile terminal transmits an RRC connection request to a CSG cell (here, Home-eNB (A)) which is not a CSG cell (here, Home-eNB (C)) for which user access has been registered, The Home-eNB (A) that has received the RRC connection establishment request transmits an establishment permission for the establishment request to the mobile terminal, thereby establishing an RRC connection between the mobile terminal and the Home-eNB (A).

  Next, in ST2707 and ST2708, the mobile terminal transmits a TAU request message to the core network via the Home-eNB (A). Here, the mobile terminal also transmits a mobile terminal identification number. The mobile terminal identification number may be included in the TAU request message, may be included with the TAU request message, or may be transmitted as a separate message. In ST2709, the core network that has received the TAU request message checks, based on the received mobile terminal identification number, whether the mobile terminal belongs to the CSG-ID of the Home-eNB (A). As the method of this check, the method described in ST2207 disclosed in FIG. 22 can be applied. Since the mobile terminal identification number is not registered in the CSG-ID to which the Home-eNB (A) belongs, the core network determines that the mobile terminal can not access the Home-eNB (A). In ST 2710 and ST 2711, the core network transmits a TAU reject message to the mobile terminal via the Home-eNB (A). In ST 2712, the mobile terminal that has received the TAU reject message releases the RRC connection with the Home-eNB (A). In ST2713 which has received the TAU reject message once, the mobile terminal performs processing to prohibit establishment of an RRC connection to the Home-eNB (A). Specifically, for example, an RRC connection establishment prohibited cell list is provided inside the mobile terminal, and the mobile terminal stores the cell identification number (PCI, Cell-ID, GCI, etc.) of the Home-eNB (A) in the list. Do. Then, before establishing the next RRC connection, the list is checked to determine whether it is a cell stored in the list. In the case of a cell stored in the list, establishment of RRC connection is prohibited. Here, the list may be CSG-ID or TAC, and the CSG-ID or TAC may be stored in association with the cell identification number. By doing so, when the Home-eNB (A) is selected again in the future by cell search and cell selection, the mobile terminal is not allowed to establish RRC connection to the Home-eNB (A). it can. The mobile terminal which can not obtain the whitelist up to ST2713 performs cell search and cell selection newly in ST2714.

  Here, when the Home-eNB (A) is selected again, the establishment of the RRC connection is prohibited, and cell selection is performed from the cells excluding the Home-eNB (A). The mobile terminal that has selected the Home-eNB (B) by cell selection performs RRC connection establishment processing with the Home-eNB (B) in ST2715. After RRC connection establishment processing is performed, in ST2716 and ST2717, the mobile terminal transmits a TAU request message to the core network via the Home-eNB (B). Whether the mobile terminal belongs to the CSG-ID (TAC) of the Home-eNB (B) based on the mobile terminal identification number received together with the core network that has received the TAU request message in ST2718 Check The method described in ST2207 disclosed in FIG. 22 can also be applied to this check method. Since the mobile terminal identification number is registered in the CSG-ID to which the Home-eNB (B) belongs, the core network determines that the mobile terminal can access the Home-eNB (B). In ST2719 and ST2720, the core network transmits a TAU accept message to the mobile terminal via the Home-eNB (B). Also, in ST2721 and ST2722, the core network transmits a whitelist to the mobile terminal via the Home-eNB (B). The mobile terminal notified of the whitelist in ST 2723 stores the whitelist in its own mobile terminal.

  In the example of the present embodiment, the mobile terminal prohibits the establishment of the RRC connection to the cell from which the TAU reject message has been received. However, all the mobile terminals belonging to the CSG-ID of the cell from which the TAU reject message is received. It is also possible to prohibit the cell from establishing an RRC connection. Also, although the process for prohibiting the establishment of the RRC connection has been described, it may be a process for prohibiting the transmission of the TAU request message or a process for inhibiting both. Also, although the process for prohibiting the establishment of the RRC connection to the cell from which the mobile terminal has received the TAU reject message once has been described, the RRC connection is established when the TAU reject message is received a plurality of times consecutively from the same cell. It may be prohibited. The number of consecutive receptions of TAU reject messages from the same cell may be transmitted as broadcast information from the cell, or may be determined in advance.

  By adopting the method disclosed in the present embodiment, a large number of CSG cells belonging to CSG-IDs for which the mobile terminal has not registered for user access exist, or a large number of mobile terminals are in such a situation. If there is a case where the white list owned by the mobile terminal is replaced due to some reason, the mobile terminal erroneously receives the content of the white list transmitted from the core network when registering or changing the white list. When manual search is performed at the mobile terminal, a situation occurs in which CSG cells continue to be selected endlessly, and the mobile terminal establishes RRC connection to a large number of CSG cells, or CSG cells. It is possible to solve the problem of unnecessarily repeating the TAU request to the core network. By solving these problems, it is possible to eliminate an extreme decrease in radio resource usage efficiency and signaling efficiency in future system operation. Furthermore, the time from the cell search to the standby operation can be shortened, and the problem that a large control delay occurs as the system can be solved. Furthermore, when manual search is performed in the mobile terminal, a situation in which CSG cells are continuously selected can be resolved, and therefore, power consumption of the mobile terminal can be reduced.

  Next, a first modified example of the sixth embodiment described above will be described. In the first modified example, a method is disclosed in which the core network transmits information on TAU rejection message of RRC connection establishment prohibition and TAU request message transmission prohibition to the mobile terminal.

  This will be described with reference to FIG. The part of FIG. 27 may be changed as follows. The description of the same operations as in the sixth embodiment will be omitted. In ST2709, the core network that has received the TAU request message checks, based on the received mobile terminal identification number, whether the mobile terminal belongs to the CSG-ID of the Home-eNB (A). Since the mobile terminal identification number is not registered in the CSG-ID to which the Home-eNB (A) belongs, the core network determines that the mobile terminal can not access the Home-eNB (A). In ST 2710 and ST 2711, the core network transmits a TAU reject message to the mobile terminal via the Home-eNB (A). At this time, the core network puts, in the TAU reject message, information on the RRC connection establishment prohibition to the Home-eNB (A) and the TAU request message transmission prohibition. Specifically, a 1-bit indicator may be provided to set “1” in the case of prohibition, and “0” in the case of permission (of course, the reverse is also possible). The mobile terminal that has received this releases the RRC connection with the Home-eNB (A) in ST 2712 and performs processing for prohibiting the establishment of the RRC connection to the Home-eNB (A) in ST 2713.

  By doing this, it is possible to obtain the same effect as that of the sixth embodiment. Furthermore, it becomes possible for the core network to determine whether to prohibit RRC connection establishment and TAU request message transmission. As a result, the core network can appropriately cause the mobile terminal to perform prohibition processing according to the current situation such as the signaling load amount and the CSG cell arrangement status, so that the system operation becomes flexible. can get.

  Next, a second modification of the sixth embodiment described above will be described. In the description of the sixth embodiment and the first modification, when the mobile terminal receives the TAU reject message, the mobile terminal prohibits the establishment of the RRC connection to the cell and prohibits the transmission of the TAU request message. Disclosed. However, when the mobile terminal newly performs user access registration (update) to the CSG cell in the above-described prohibited state, a problem may occur.

  If the mobile terminal has been prohibited from establishing the RRC connection for the CSG-ID of the CSG cell and transmitting the TAU request message before registration of a new user access, the mobile terminal newly transmits the user to the CSG cell. Even if the access registration is performed, it is conceivable that the establishment of the RRC connection and the transmission of the TAU request message are continued to the CSG cell, and the access becomes impossible. In order to solve such a problem, it is disclosed to provide a timer for canceling the establishment of RRC connection establishment and the prohibition of TAU request message transmission as a second modification. The value of the timer may be determined in advance as a value common to all cells or may be broadcasted by broadcast information of the CSG cell.

  When alerting | reporting by the alerting | reporting information of a CSG cell, a value may differ for every cell. This enables flexible operation for each cell. Also, the message may be transmitted by being included in the TAU reject message shown in ST 2710 and ST 2711 in FIG. It may be the first TAU reject message, or it may be a TAU reject message immediately before the establishment of the RRC connection is prohibited or the transmission of the TAU request message is prohibited. In this case, the core network can set the value of the timer, and furthermore, can be set individually for each mobile terminal, so the system status such as the signaling load, the remaining battery capacity of the mobile terminal, etc. It is possible to set the value of the timer appropriately according to the situation specific to the mobile terminal. The start of the timer may be, for example, TAU request message transmission to a certain CSG cell. The timer may be ended when the timer time is ended, when a TAU accept message is received from the CSG cell, or when user access registration (update) is performed on a new CSG cell. In addition, an example of a process in a mobile terminal at the time of providing a timer in FIG. 28 is disclosed.

  The mobile terminal that has started the Home-eNB (CSG cell) manual search performs cell search and cell selection in ST2801. The mobile terminal, in ST2802, determines whether the timer is running because the CSG-ID (TAC) of the Home-eNB for which the cell is selected is TAU prohibited. For example, specifically, CSG-ID (TAC) and a timer set in the CSG-ID (TAC) may be put on the prohibition list shown in the process of ST2713 in FIG. It may be determined by looking at the timer of the list. If the timer is running, the selected CSG cell is TAU inhibited, so that the cell is not CSG-ID (TAC) for which TAU is inhibited in ST 2803 and cell selection is performed, and the process moves to ST 2804. On the other hand, when the CSG cell in which the timer is not running is selected in ST 2802, the CSG cell is not TAU prohibited, so that the process proceeds to ST 2804 to transmit a TAU request to the Home-eNB that has selected the cell. In ST2805, using the TAU request transmission as a trigger, a timer is set for the CSG-ID (TAC) of the Home-eNB that has made the TAU request. In ST 2806, the NAS message for the TAU request message is received from the Home-eNB.

  The mobile terminal, in ST2807, determines whether the NAS message received in ST2806 is a TAU reject or a TAU accept. In the case of TAU accept, the processing proceeds to ST2808, the timer ends and the timer is reset. Then, white list registration processing is performed in ST2809, and the process proceeds to the normal processing. On the other hand, if it is determined that the TAU is rejected in ST2807, the process shifts to ST2810, and it is determined again whether the timer period has ended. If the timer period has ended in ST 2810, the process moves to ST 2812, TAU is permitted for the CSG-ID (TAC) of the Home-eNB that has made the TAU request, the timer is reset in ST 2813, and cell search is performed again. Move to selection. If the timer period has not ended in ST 2810, the cell search and cell selection are again performed while inhibiting TAU for the CSG-ID (TAC) of the Home-eNB that has made the TAU request. Note that whether or not the timer period has ended may be included in the processing in ST2802, for example, as well as when shown in FIG. If the timer period has ended, processing of ST2812 and ST2813 may be performed, and then the processing may shift to ST2804. If the timer period has not ended, the process of ST 2811 may be performed, and then the process may shift to ST 2803.

  As described above, by providing timers for releasing RRC connection establishment prohibition and TAU request message transmission prohibition, the same effects as those described in the sixth embodiment and the first modification can be obtained. . In addition, it is possible to solve the problem that access becomes impossible when the mobile terminal newly performs user access registration (update) to the CSG cell. This makes it possible to construct a more stable system.

  In the sixth embodiment described above, LTE and UMTS using Home-eNB and Home-NB in which CSG is used have been described. However, the present invention is also applicable to UMTS using Home-NBs where CSG is not used. In the case of UMTS using a Home-NB in which a CSG is not used, when a mobile terminal accesses a Home-eNB that has performed user access registration and the access is successful, the Home-NB to the cell identification number of the Home-NB (Cell Identity , PCI, GCI, etc.) and register them in a whitelist in the mobile terminal (in the case of UMTS, referred to as a cell identification number whitelist). Also in this case, when a Home-NB different from the Home-NB to which the mobile terminal has registered for user access continues to be selected by cell search and cell selection, the mobile terminal can not receive the cell identification number registered for the user access registration. And it may take time to receive.

  In order to solve such a problem, it is possible to apply the method of Embodiment 6 to UMTS that uses a Home-NB in which CSG is not used. The mobile terminal receives the TAU reject message, and the mobile terminal prohibits the establishment of the RRC connection to the cell, prohibits the transmission of the TAU request message, and the mobile terminal performs the TAU reject message by the subsequent cell search and cell selection. Since the Home-NB different from the Home-NB that has received the is to be selected, it is not possible to keep selecting the Home-NB different from the Home-NB that the mobile terminal has registered for user access.

  In the case of a UMTS communication system, an RNC is provided between the base station (Home-NB, NB) and the core network, and RRC messages such as RRC connection request are transmitted and received between the mobile terminal and the RNC. The NAS message such as the TAU request may be transmitted and received from the mobile terminal to the core network via the base station (Home-NB, NB) and the RNC. By doing this, it becomes possible to apply also in the case of a UMTS communication system in which Home-NB is used as a CSG cell. Therefore, there is no need for the mobile terminal to perform unnecessary cell search and cell selection, and it takes a long time to enter the standby operation from the cell search, causing a large control delay as a system, and the mobile terminal Can solve the problem that the power consumption becomes enormous. In the future, it will be possible to construct a mobile communication system that can meet the requirements for dealing with cases where there are a large number of Home-NBs installed and where the installation and removal of Home-NBs becomes frequent and flexible.

Embodiment 7
In order to solve the problems described in the fifth embodiment, in the present embodiment, the core network continuously transmits n times (an integer of n11) TAU reject messages to the same mobile terminal. In the case, the core network discloses a method of transmitting the white list before transmitting the n-th TAU reject message.

  FIG. 29 shows a sequence diagram of a method of transmitting a whitelist before transmitting the n-th TAU reject message, in the case where the TAU reject message is transmitted twice consecutively to the same mobile terminal. Show. The figure will be described. The figure shows, for example, an LTE system using a Home-eNB. Here, the mobile terminal is assumed to perform user access registration in Home-eNB (B), but the operation from ST 2901 to ST 2903 is the same as that described above, and therefore the description is omitted. The mobile terminal which has started the manual search of the CSG cell (here, Home-eNB) in ST2904 performs cell search and cell selection in ST2905. In the situation as shown in FIG. 23, when there are a huge number of CSG cells belonging to CSG-IDs for which the mobile terminal has not been registered for user access, the CSG-ID for which the mobile terminal has not been registered for user access Cell selection of the belonging CSG cell is often performed. As disclosed in the fourth embodiment, the mobile terminal enables establishment of an RRC connection to the CSG cell regardless of whether the cell-selected CSG cell is a CSG cell for which user access registration has been performed or not, and the CSG cell is Enables TAU to be sent to the network via By this means, in ST 2906, the mobile terminal transmits an RRC connection request message to a CSG cell (here, Home-eNB (A)) that is not a CSG cell (here, Home-eNB (C)) for which user access was registered. The Home-eNB (A) that has received the request message of the RRC connection transmits an allowance for the request to the mobile terminal, thereby establishing an RRC connection between the mobile terminal and the Home-eNB (A).

  Next, in ST2907 and ST2908, the mobile terminal transmits a TAU request message to the core network via the Home-eNB (A). Here, the mobile terminal also transmits a mobile terminal identification number. The mobile terminal identification number may be included in the TAU request message, may be sent together with the TAU request message, or may be sent as a separate message. In ST2909, the core network that has received the TAU request message checks, based on the received mobile terminal identification number, whether the mobile terminal belongs to the CSG-ID of the Home-eNB (A). As the method of this check, the method described in ST2207 disclosed in FIG. 22 can be applied. Since the mobile terminal identification number is not registered in the CSG-ID to which the Home-eNB (A) belongs, the core network determines that the mobile terminal can not access the Home-eNB (A). The core network determined that the mobile terminal can not access the Home-eNB (A) further counts the number of rejects to the mobile terminal (n = 1). The core network transmits a TAU reject message to the mobile terminal via the Home-eNB (A) in ST 2910 and ST 2911. In ST 2912, the mobile terminal that has received the TAU reject message releases the RRC connection with the Home-eNB (A). The mobile terminal which can not obtain the whitelist up to ST2912 newly performs cell search and cell selection in ST2913. Here, when Home-eNB (A) is selected again, in ST 2914, an RRC connection is established again with Home-eNB (A). Next, in ST2915 and ST2916, the mobile terminal transmits a TAU request message to the core network via the Home-eNB (A). Here, the mobile terminal also transmits a mobile terminal identification number.

  In ST2917, the core network that has received the TAU request message checks, based on the received mobile terminal identification number, whether the mobile terminal belongs to the CSG-ID of the Home-eNB (A). As in ST 2909, since the mobile terminal identification number is not registered in the CSG-ID to which the Home-eNB (A) belongs, the core network is said that the mobile terminal can not access the Home-eNB (A). judge. The core network determined that the mobile terminal can not access the Home-eNB (A) increments the number of rejects to the mobile terminal by one (n = 2). Since the number of rejects to the same mobile terminal is two, the core network transmits a whitelist registration message before transmitting the second TAU reject message. The core network transmits a whitelist to the mobile terminal via the Home-eNB (B) in ST2918 and ST2919. The mobile terminal notified of the whitelist in ST 2920 stores the whitelist in its own mobile terminal. The core network that has transmitted the white list of the mobile terminal to the Home-eNB (A) in ST 2918 moves the second TAU reject message for the TAU request via the Home-eNB (A) in ST 2921 and ST 2922 Send to the terminal. The mobile terminal that has received the TAU reject message releases an RRC connection with the Home-eNB (A) in ST2923. The number of consecutive TAU reject message transmissions to the same mobile terminal may be determined in advance, but it is also possible to flexibly determine the core network. By flexibly determining the core network, it is possible to transmit the whitelist to the mobile terminal appropriately according to the current situation such as the amount of signaling load and reception quality of the mobile terminal, so the system operation is flexible. The effect of becoming

  By adopting the method disclosed in the present embodiment, a large number of CSG cells belonging to CSG-IDs for which the mobile terminal has not registered for user access exist, or a large number of mobile terminals are in such a situation. If there is a case where the white list owned by the mobile terminal is replaced due to some reason, the mobile terminal erroneously receives the content of the white list transmitted from the core network when registering or changing the white list. When manual search is performed at the mobile terminal, a situation occurs in which CSG cells continue to be selected endlessly, and the mobile terminal establishes RRC connection to a large number of CSG cells, or CSG cells. It is possible to solve the problem of unnecessarily repeating the TAU request to the core network. By solving these problems, it is possible to eliminate an extreme decrease in radio resource usage efficiency and signaling efficiency in future system operation. Furthermore, the time from the cell search to the standby operation can be shortened, and the problem that a large control delay occurs as the system can be solved. Furthermore, when manual search is performed in the mobile terminal, a situation in which CSG cells are continuously selected can be resolved, and therefore, power consumption of the mobile terminal can be reduced.

Eighth Embodiment
In the fourth to seventh embodiments described above, the RRC connection is established with a CSG cell belonging to a CSG-ID in which the mobile terminal has not registered for user access, and the TAU reject message transmitted by the core network to the mobile terminal is The method used was disclosed. However, in any of these cases, it is necessary to establish an RRC connection between the mobile terminal and a CSG cell belonging to a CSG-ID to which the mobile terminal has not registered for user access, and further, the mobile terminal and core network It was necessary to send and receive NAS messages such as TAU requests between them.

  Therefore, instead of using the TAU reject message transmitted to the mobile terminal by the core network, a method of registering a white list using the RRC connection reject message for the RRC connection request message transmitted by the mobile terminal is disclosed. By this, it is not necessary to transmit and receive NAS messages such as RRC connection establishment and TAU request. For example, in the method disclosed in the sixth embodiment, instead of using the TAU reject message transmitted by the core network to the mobile terminal, the white space is generated using the RRC connection reject message for the RRC connection request message transmitted by the mobile terminal. Disclose a method for registering a list. When the mobile terminal receives the RRC connection reject message n times (n 整数 1 integer) continuously from the same cell, the mobile terminal prohibits the RRC connection request to the cell.

  FIG. 30 shows a sequence diagram of a method in which the mobile terminal forbids RRC connection request to the cell when the RRC connection reject message is received from the same cell once. The figure will be described. The figure shows, for example, an LTE system using a Home-eNB. Here, although a mobile terminal performs user access registration to Home-eNB (B), since it is the operation | movement similar to the above to ST3001-ST3003, it abbreviate | omits description. In ST3004 and ST3005, the core network transmits, to all CSG cells (here, Home-eNB), information on CGS-ID (TAC) of each Home-eNB and identification numbers of mobile terminals belonging to the CSG-ID. deep. For example, the core network transmits, to the Home-eNB (B), information on a mobile terminal identification number belonging to the CSG-ID of the Home-eNB (B), and for the Home-eNB (A), The information of the mobile terminal identification number which belongs to CSG-ID of Home-eNB (A) is transmitted. As a specific example of such information, it may be a list in which mobile terminal identification numbers belonging to CSG-ID are described. The list corresponding to the CSG-ID of each Home-eNB is sent from the core network to each Home-eNB.

  The mobile terminal which has started the manual search of Home-eNB in ST3006 performs cell search and cell selection in ST3007. In the situation as shown in FIG. 23, when there are a huge number of CSG cells belonging to CSG-IDs for which the mobile terminal has not been registered for user access, the CSG-ID for which the mobile terminal has not been registered for user access Cell selection of the belonging CSG cell is often performed. In the present embodiment, the mobile terminal can transmit a request message of RRC connection to the CSG cell regardless of whether the cell-selected CSG cell is a CSG cell for which user access registration has been performed. The mobile terminal also transmits a mobile terminal identification number. The mobile terminal identification number may be included in the RRC connection request message or may be included with the RRC connection request message. By this means, in ST 3008, the mobile terminal transmits an RRC connection request to a CSG cell (here Home-eNB (A)) which is not a CSG cell (here Home-eNB (B)) for which user access was registered. Whether the Home-eNB (A) that received this RRC connection request in ST 3009 belongs to the CSG-ID of the Home-eNB (A) based on the Mobile Terminal Identification Number also received Check if This check determines whether the mobile terminal identification number is included in the mobile terminal identification number list belonging to the CSG-ID of the Home-eNB (A) transmitted from the core network in ST3008.

  Since the mobile terminal identification number is not registered in the CSG-ID to which the Home-eNB (A) belongs, the Home-eNB (A) determines that the mobile terminal can not access the Home-eNB (A). Do. In ST3010, the Home-eNB (A) transmits an RRC connection reject message to the mobile terminal. The mobile terminal that has received the RRC connection reject message once performs processing to prohibit the transmission of the RRC connection request message to the Home-eNB (A) in ST3011. Specifically, for example, an RRC connection request transmission prohibited cell list is provided inside the mobile terminal, and the mobile terminal stores the cell identification number (PCI, Cell-ID, GCI, etc.) of the Home-eNB (A) in the list. Do. Then, before the next RRC connection request transmission, the list is checked to determine whether it is a cell stored in the list. In the case of a cell stored in the list, transmission of an RRC connection request is prohibited. Here, what is stored in the list may be the CSG-ID or TAC of the CSG cell, and the CSG-ID or TAC may be stored in association with the CSG cell identification number. By doing this, when the Home-eNB (A) is selected again in the future by cell search and cell selection, the mobile terminal does not transmit an RRC connection request to the Home-eNB (A). It can be done.

  The mobile terminal that can not obtain the whitelist up to ST3011 newly performs cell search and cell selection in ST3012. Here, when Home-eNB (A) is selected again, since transmission of an RRC connection request | requirement is prohibited, cell selection will be performed from the cell except Home-eNB (A). The mobile terminal that has selected the Home-eNB (B) by cell selection transmits an RRC connection request message to the Home-eNB (B) in ST3013. The Home-eNB (B), which received the TAU request message in ST 3014, uses the mobile terminal identification number received together, and the mobile terminal receives the CSG-ID (TAC) of the Home-eNB (B). Check if it belongs. The method described above can be applied to this check method. Since the mobile terminal identification number is registered in the CSG-ID to which the Home-eNB (B) belongs, the Home-eNB (B) determines that the mobile terminal can access its own cell. The Home-eNB (B) that has determined that the mobile terminal can access its own cell may notify the mobile terminal of a whitelist in ST 3015 before transmitting an RRC connection accept message. The mobile terminal that has received the whitelist in ST3016 stores the whitelist in its own mobile terminal. Home-eNB (B) which transmitted the whitelist with respect to this mobile terminal transmits a RRC connection accept message by ST3017. Thus, an RRC connection is established between the mobile terminal and the Home-eNB (B) (ST3018). After that, in ST3019 and ST3020, the mobile terminal transmits a TAU request message to the core network via the Home-eNB (B). Here, the mobile terminal also transmits a mobile terminal identification number.

  The core network that has received the TAU request message checks the CSG-ID (TAC) in ST 3021 based on the received mobile terminal identification number. The core network that has confirmed that the mobile terminal belongs to the CSG-ID (TAC) of the Home-eNB (B) in ST 3021 performs TAU accept on the mobile terminal in ST 3022 and ST 3023 as Home-eNB (B). Send via. In ST3004 and ST3005, the core network transmits the information of CGS-ID (TAC) of each Home-eNB and the identification number of the mobile terminal belonging to the CSG-ID to all CSG cells (here, Home-eNB). Although the information is stored, information of the mobile terminal identification number belonging to each CSG-ID may be transmitted to the HeNBGW connected to the CSG cell belonging to the CSG-ID. The HeNBGW may transmit information of the mobile terminal identification number belonging to each received CSG-ID to the CSG cell of the same CSG-ID connected to the own HeNB. In addition, the HeNBGW transmits the information of the mobile terminal identification number belonging to each received CSG-ID to the CSG cell of the same CSG-ID connected to the own HeNB from the mobile terminal in ST3008. When a CSG cell that has received an RRC connection request of 1 sends out a message requesting information on a mobile terminal identification number belonging to the CSG-ID of the own CSG cell to the HeNBGW, and the HeNBGW receives the message. It may be done.

  Although the mobile terminal prohibits RRC connection request to the CSG cell that has received the RRC connection reject message in the present embodiment, all the mobile terminals belonging to the CSG-ID of the cell that received the RRC connection reject message are described. The request of the RRC connection may be prohibited to the cell of Also, although the process for prohibiting the RRC connection request to the CSG cell in which the mobile terminal has received the RRC connection reject message once has been described, the RRC connection is rejected when the RRC connection reject message is received multiple times continuously from the same cell. May be prohibited. The number of consecutive receptions of the RRC connection reject message from the same cell may be transmitted as broadcast information from the cell, or may be determined in advance. Also, the notification of the white list was performed before the Home-eNB sent an RRC connection accept, but after receiving the TAU accept of ST 3023, the NAS message moved from the core network via the CSG cell by the NAS message. It may be transmitted to the terminal.

  Next, for example, in the method disclosed in the fifth embodiment or the seventh embodiment, the RRC connection to the RRC connection request message transmitted by the mobile terminal, not using the TAU reject message transmitted by the core network to the mobile terminal Disclosed is a method of transmitting a white list using a reject message. In the fifth and seventh embodiments, it is necessary to transmit the whitelist of the mobile terminal also from the CSG cell belonging to the CSG-ID in which the mobile terminal is not registered for user access. Therefore, the core network transmits, to all CSG cells, information on all CSG-IDs (TACs) and identification numbers of mobile terminals belonging to the CSG-IDs.

  FIG. 31 shows a sequence diagram of a method in which a CSG cell belonging to a CSG-ID whose mobile terminal has not been registered for user access transmits a white list before transmitting an RRC connection reject message. FIG. 31 shows, for example, the case of an LTE system using a Home-eNB. Here, although the mobile terminal performs user access registration to Home-eNB (C), the operation from ST 3101 to ST 3103 is the same as that described above, and therefore, the description is omitted. In ST3104, the core network transmits, to all CSG cells (here, all Home-eNBs), information on all CGS-ID (TAC) and identification numbers of mobile terminals belonging to the CSG-ID. As a specific example of such information, it may be a list in which mobile terminal identification numbers belonging to CSG-ID are described. The list corresponding to all CSG-IDs is sent from the core network to all Home-eNBs. The mobile terminal which has started the manual search of Home-eNB in ST3105 performs cell search and cell selection in ST3106. In the situation as shown in FIG. 23, when there are a huge number of CSG cells belonging to CSG-IDs for which the mobile terminal has not been registered for user access, the CSG-ID for which the mobile terminal has not been registered for user access Cell selection of the belonging CSG cell is often performed. In the present embodiment, the mobile terminal can transmit a request message of RRC connection to the CSG cell regardless of whether the cell-selected CSG cell is a CSG cell for which user access registration has been performed. The mobile terminal also transmits a mobile terminal identification number. The mobile terminal identification number may be included in the RRC connection request message or may be included with the RRC connection request message.

  Accordingly, in ST 3107, the mobile terminal transmits an RRC connection request to a CSG cell (here, Home-eNB (A)) that is not a CSG cell (here, Home-eNB (C)) for which user access registration has been performed. In ST3108, the Home-eNB (A) that has received this RRC connection request checks based on the received mobile terminal identification number whether to which CSG-ID the mobile terminal belongs. This check is performed using the mobile terminal identification number list belonging to all CSG-IDs transmitted from the core network in ST3104. Home-eNB (A) searches and specifies CSG-ID in which the said mobile terminal identification number is contained. In ST3109, the Home-eNB (A) notifies the mobile terminal of a whitelist using the identified CSG-ID. In ST 3110, the mobile terminal that has received the whitelist stores the whitelist in its own mobile terminal. Home-eNB (A) which notified the said whitelist to this mobile terminal by ST3109 transmits an RRC connection reject message with respect to this mobile terminal by ST3111.

  In addition, in ST3104, the core network transmits information on all CGS-ID (TAC) and identification numbers of mobile terminals belonging to the CSG-ID to all CSG cells (here, all Home-eNBs). However, information on mobile terminal identification numbers belonging to each CSG-ID may be transmitted to all HeNBGWs. The HeNBGW may transmit information on mobile terminal identification numbers belonging to all CSG-IDs to all CSG cells connected to the own HeNB. Also, for all HeNBGWs, the process of transmitting the information of mobile terminal identification numbers belonging to all received CSG-IDs to all CSG cells connected to the own HeNB receives the RRC connection request from the mobile terminal in ST 3107 A message may be sent out that the requested CSG cell requests the HeNBGW for information on mobile terminal identification numbers that belong to all CSG-IDs, and this may be performed when the HeNBGW receives the message. By adopting such a method, it is possible to transmit the whitelist of the mobile terminal also from the CSG cell belonging to the CSG-ID in which the mobile terminal is not registered for user access.

  By adopting the method disclosed in the above description, in addition to the effects described in the fourth to seventh embodiments, the establishment of an RRC connection and the transmission and reception of NAS messages such as a TAU request and the like can be omitted. Furthermore, it is possible to improve the utilization efficiency of radio resources, reduce the signaling load, reduce the control delay as the system, and reduce the power consumption of the mobile terminal.

Embodiment 9
In the third to seventh embodiments described above, a mobile terminal that has registered for user access to a CSG cell transmits a TAU request to the core network in order to obtain a whitelist from the core network. The core network to which a TAU request has been transmitted from the mobile terminal is described to check the CSG-ID (TAC) using the identification number of the mobile terminal and transmit the whitelist to the mobile terminal. .

  The core network may transmit the whitelist according to the above method whenever the mobile terminal transmits a TAU request message. However, TAU request messages may occur for other reasons as well as for obtaining a whitelist from the core network. For example, when the mobile terminal already has two CSG-IDs in the whitelist and moves from a CSG cell belonging to one CSG-ID to a CSG cell belonging to another CSG-ID, new white, etc. Although there is no need to register (update) the list, the mobile terminal transmits a TAU request to the core network since the TACs of the two CSG cells are different. In such a case, although it is not necessary for the core network to transmit the whitelist to the mobile terminal, the whitelist is to be transmitted to the mobile terminal, and the signaling load is unnecessarily increased. Problems will arise.

  Furthermore, in the method disclosed in the first modification or the seventh embodiment of the sixth embodiment, it is possible to determine that the core network prohibits the mobile terminal from establishing an RRC connection or transmitting a TAU request. Even in this case, it is better for the core network to know whether the TAU request message sent by the mobile terminal is for a whitelist request, and for other reasons if it does not know Because it takes into account the TAU request message that has been sent, it results in inefficient operation. In order to solve such a problem, in the present embodiment, it is disclosed that information indicating that it is for a white list (registration) update request or a white list transmission (notification) request is placed on the TAU request message. .

  For example, in the case of the example shown in FIG. 25 described in Embodiment 5, the mobile terminal transmits a TAU request to the core network via the Home-eNB (A) in ST2507 and ST2508. The TAU request message includes information indicating that it is for a whitelist (registration) update request, and the core network is notified along with the TAU request that the reason is for a whitelist (registration) update request. Do. By configuring in this way, the core network can know that the mobile terminal is requesting a whitelist (registration) update. Conversely, if there is no information on the TAU request message indicating that it is for the whitelist (registration) update request, the TAU request message does not request the whitelist (registration) update. It is not necessary to send a white list to the mobile terminal. As a specific method of placing information indicating that the request is a white list (registration) update request on the TAU request message, a white list (registration) update request may be added to the TAU Type information. The Type information may be indicated by a numerical value. In addition, a 1-bit indicator may be provided on the TAU request message to indicate whether it is for a whitelist (registration) update request.

  By adopting the method described above, although it is not necessary for the core network to transmit a whitelist to the mobile terminal, the transmission of the whitelist to the mobile terminal increases the originally unnecessary signaling load. Can be suppressed. In addition, when the core network decides to forbid establishment of RRC connection or transmission of TAU request to the mobile terminal, the efficiency is low by considering the TAU request message transmitted for other reasons. It is possible to solve the problem of causing an action.

  Next, a first modification of the present embodiment will be described. The method of placing the information used for the white list (registration) update request on the TAU request message is applicable to the third to seventh embodiments. Here, in order to apply the method disclosed in the eighth embodiment, the information indicating that it is for the white list (registration) update request or the white list transmission (notification) request is placed on the RRC connection request message. Disclose.

  In the eighth embodiment, the whitelist is transmitted using the RRC connection reject message for the RRC connection request message transmitted by the mobile terminal. The CSG cell transmitted the RRC connection request from the mobile terminal performs CSG-ID (TAC) check using the identification number of the mobile terminal and explained that the white list is transmitted to the mobile terminal. . The CSG cell may transmit the whitelist according to the above method whenever the RRC connection request message is transmitted from the mobile terminal, but in this case, as described above, the CSG cell is wasted. The problem of reducing the use efficiency of the radio resource occurs, and further causes an inefficient operation. In order to solve such a problem, this modification 1 discloses that information indicating that it is for a white list (registration) update request is placed on the RRC connection request message.

  For example, in the case of the example shown in FIG. 31 described in Embodiment 8, the mobile terminal transmits an RRC connection request to the Home-eNB (A) in ST3107. Information indicating that it is for the white list (registration) update request is put on the RRC connection request message, and the Home is that the reason is for the white list (registration) update request together with the RRC connection request. It notifies eNB (A). By doing so, the Home-eNB (A) can know that the mobile terminal has requested a white list (registration) update. On the other hand, when the information indicating that it is for the white list (registration) update request is not included in the RRC connection request message, the RRC connection request message requests the white list (registration) update. It can be seen that it is not a thing, and it is not necessary to send a white list to the mobile terminal.

  As a specific method of putting information indicating that it is for the white list (registration) update request on the RRC connection request message, the white list (registration) update request as the cause information of the RRC connection request message Just add The reason information may be indicated numerically. Also, a 1-bit indicator may be provided on the RRC connection request message to indicate whether it is for a whitelist (registration) update request. Although the present modification has been described as applied to the method disclosed in the eighth embodiment, it is also possible to apply to the third to seventh embodiments. It is possible to apply at the time of the request | requirement of the RRC connection performed at the time of a whitelist (registration) update request.

  By using the method disclosed in this embodiment, in addition to the effects described in Embodiment 8, it is not necessary for the CSG cell to transmit a whitelist to the mobile terminal as described above. Regardless of this, a whitelist registration (update) notification message will be sent to the mobile terminal, and the radio resource may be wasted unnecessarily, and the CSG cell may request the mobile terminal to make an RRC connection request. When it is determined to prohibit transmission, it is possible to solve the problem of causing an inefficient operation by considering also the RRC connection request message transmitted for other reasons. Also, by placing information indicating that it is for a white list (registration) update request on the TAU request message or the RRC connection request message, RRC to a CSG cell that is not a CSG cell to which the mobile terminal has registered for user access The establishment of a connection and the transmission of a TAU request message to the core network through the CSG cell are not limited to the time of manual search activation. By applying the method described in the present embodiment and the modification, if the mobile terminal is for the (registration) update request for the whitelist, the CSG cell to which the mobile terminal is not a CSG cell for which the user access has been registered. The establishment of the RRC connection and the transmission of the TAU request message to the core network via the CSG cell may be permitted, whereby, for example, after the user access registration, the manual search is not activated and automatic operation is performed. It is also possible to perform communication for obtaining the whitelist periodically, or periodically (eg, periodically, at a predetermined cycle) until obtaining the whitelist without activating the manual search. ) It is also possible to perform communication for obtaining a white list. By doing this, the procedure until the mobile terminal acquires the registered (updated) whitelist can be made flexible, and a large number of CSG cells in the future will be installed, and user access registration will be performed in various places. It is possible to cope with such a situation. Note that by applying the method described in the present embodiment and the modification, the information indicating that the mobile terminal has started the manual search as disclosed in the fourth and fifth embodiments can be used for RRC connection request or the like. There is no need to include it in the TAU request, and the amount of signaling can be reduced.

Embodiment 10
In the fourth to seventh embodiments, the mobile terminal that has registered for user access in the CSG cell transmits a TAU request to the core network via the CSG cell in order to obtain a whitelist from the core network (CN). It will be. The core network to which the TAU request has been transmitted from the mobile terminal performs a CSG-ID (TAC) check using the identification number of the mobile terminal, and when it is determined that access to the CSG cell is not possible, the core network It has been described to transmit a TAU reject message to the mobile terminal via the CSG cell. On the other hand, the method has also been described in which the mobile terminal determines the next operation according to the TAU reject message received from the core network via the CSG cell. In such a case, the mobile terminal should know whether or not the TAU reject message received via the CSG cell was for a TAU request for a whitelist registration (update) request, and does not know Because it also considers TAU reject messages sent for other reasons, it causes inefficient operation.

  On the other hand, in 3GPP, it is considered to add reason information of "no suitable cells" to the TAU reject message or the RRC connection reject message. However, as described above, since there are many types of definitions of "suitable cells", it is not possible to specify which definition is not applied. In order to solve such a problem, in the present embodiment, the reason for rejection is indicated on the TAU reject message because the mobile terminal identification number is not registered in the CSG-ID to which the CSG cell belongs. Disclosure of information.

  For example, in the case of the example shown in FIG. 27 described in the sixth embodiment, the core network transmits a TAU request reject message to the mobile terminal via the Home-eNB (A) in ST2710 and ST2711. The reason is that the reason for the rejection is that the CSG-ID to which the Home-eNB (A) belongs is not registered in the CSG-ID to which the reason for the rejection is added. It notifies that it is because this mobile terminal identification number is not registered into CSG-ID to which Home-eNB (A) belongs. By doing so, the mobile terminal can know that the reason for the received TAU request reject message is that the mobile terminal identification number is not registered in the CSG-ID to which the CSG cell belongs. Become. Conversely, if there is no information indicating that the mobile terminal identification number is not registered in the CSG-ID to which the CSG cell belongs, the TAU reject message indicates that the TAU reject message does not contain the TAU reject message. It turns out that the message is for some other reason.

  As a specific method of placing information indicating that the reason for rejection is on the CSG cell to which the CSG cell belongs is not registered in the TAU reject message, the TAU reject message In the CSG-ID to which the CSG cell belongs, information indicating that the mobile terminal identification number is not registered may be added to the cause information. The reason information may be indicated numerically. Also, a CSG-ID to which a CSG cell belongs may be provided on the TAU request reject message with a 1-bit indicator indicating whether the mobile terminal identification number is not registered.

  By using the method disclosed in the present embodiment, in addition to the effects described in the fourth to seventh embodiments, as described above, RRC is performed on the TAU reject message transmitted from the core network by the mobile terminal. In the case of deciding to forbid the establishment of a connection or the transmission of a TAU request, the problem of causing an inefficient operation by considering the TAU reject message transmitted for other reasons may be solved. It becomes possible.

  Next, a first modification of the tenth embodiment described above will be described. Here, in order to apply the method disclosed in the eighth embodiment, the reason for the rejection on the RRC connection reject message is information indicating that the mobile terminal identification number is not registered in the CSG-ID to which the CSG cell belongs. Disclose what to put on. In the eighth embodiment, it has been described that the mobile terminal prohibits the transmission of the RRC connection request message using the RRC connection reject message for the RRC connection request message transmitted by the mobile terminal. The mobile terminal may forbid the transmission of the RRC connection request message to the CSG cell whenever the RRC connection reject message is transmitted from the CSG cell, but if this is done, it will be said that It also causes inefficient operation.

  In order to solve such a problem, in the first modification, the reason for rejection is indicated on the RRC connection reject message because the mobile terminal identification number is not registered in the CSG-ID to which the CSG cell belongs. Disclosure of information. For example, in the case of the example shown in FIG. 31 described in Embodiment 8, the mobile terminal receives an RRC connection reject from the Home-eNB (A) in ST3110. The Home-eNB (A) is an information indicating that the reason for the rejection is because the mobile terminal identification number is not registered in the CSG-ID to which the Home-eNB (A) belongs in the RRC connection reject message. The mobile terminal is notified that the reason for the rejection is that the mobile terminal identification number is not registered in the CSG-ID to which the Home-eNB (A) belongs. By doing so, the mobile terminal can know that the received RRC connection reject message is because the mobile terminal identification number is not registered in the CSG-ID to which the CSG cell belongs. . Conversely, if there is no information indicating that the mobile terminal identification number is not registered in the CSG-ID to which the CSG cell belongs, in the RRC connection reject message, the rejection is rejected. It is possible to know that the reason is that the mobile terminal identification number is not registered in the CSG-ID to which the CSG cell belongs.

  As a specific method of placing information indicating that the reason for rejection is on the RRC connection reject message and the mobile terminal identification number is not registered in the CSG-ID to which the CSG cell belongs, RRC connection reject Information indicating that the mobile terminal identification number is not registered may be added to the CSG-ID to which the CSG cell belongs, in the message (cause) information. The reason information may be indicated numerically. In addition, a CSG-ID to which a CSG cell belongs may be provided on the RRC connection reject message with a 1-bit indicator indicating whether the mobile terminal identification number is not registered.

  By using the method disclosed in the present embodiment, in addition to the effects described in Embodiment 8, the RRC connection request is made when the mobile terminal receives an RRC connection reject message from the CSG cell as described above. It is possible to solve the problem of causing an inefficient operation by considering also the RRC connection reject message transmitted for other reasons in the case of the method of judging the prohibition of.

Embodiment 11
When registering or changing the whitelist, it was described that the mobile terminal may erroneously receive the whitelist contents transmitted from the core network. In such a case, there may be a case where a CSG cell belonging to the CSG-ID of the whitelist received erroneously is selected in a situation where there are a large number of CSG cells, and the mobile terminal selects the CSG of the wrong whitelist. The establishment of the RRC connection to the CSG cell belonging to the ID many times and the request of the TAU to the core network through the CSG cell will be repeated. Therefore, there arises a problem that the system causes an extreme decrease in utilization efficiency of radio resources and signaling efficiency. Furthermore, it takes a long time from the cell search to the standby operation, causing a problem that a large control delay occurs as a system, and a problem that the power consumption of the mobile terminal becomes enormous.

  In order to solve these problems, the present embodiment discloses a method of explicitly transmitting success / failure (Ack / Nack) of white list reception to the core network. FIG. 32 shows a sequence diagram of a method of explicitly transmitting success / failure (Ack / Nack, complete / incomplete, complete / incomplete) of whitelist reception in the mobile terminal to the core network at the time of whitelist registration. The figure shows, for example, the case of a communication system of the LTE scheme using a Home-eNB. The figure will be described. Here, although the mobile terminal performs user access registration to Home-eNB (C), the operation from ST3201 to ST3203 is the same as that described above, and therefore, the description thereof is omitted. The mobile terminal which has started the manual search of the CSG cell (here, Home-eNB) in ST3204 performs cell search and cell selection in ST3205. In the situation as shown in FIG. 23, when there are a large number of CSG cells belonging to CSG-IDs for which the mobile terminal has not registered for user access, the mobile terminal selects a CSG cell. As disclosed in the fourth embodiment, the mobile terminal enables establishment of an RRC connection to the CSG cell regardless of whether the cell-selected CSG cell is a CSG cell for which user access registration has been performed or not, and the CSG cell is Enables TAU to be sent to the network via By this means, the mobile terminal, in ST 3206, transmits a request for RRC connection to a CSG cell (here, Home-eNB (A)) that is not a CSG cell (here, Home-eNB (C)) for which user access was registered. The Home-eNB (A) that has received the RRC connection establishment request transmits an establishment permission to the establishment request to the mobile terminal, thereby establishing an RRC connection between the mobile terminal and the Home-eNB (A).

  Next, in ST3207 and ST3208, the mobile terminal transmits a TAU request message to the core network via the Home-eNB (A). Here, the mobile terminal also transmits a mobile terminal identification number. The mobile terminal identification number may be included in the TAU request message, may be included with the TAU request message, or may be transmitted as a separate message. The core network that has received the TAU request message checks whether the mobile terminal belongs to the CSG-ID of the Home-eNB (A) based on the received mobile terminal identification number. As the method of this check, the method described in ST2207 disclosed in FIG. 22 can be applied. Since the mobile terminal identification number is not registered in the CSG-ID to which the Home-eNB (A) belongs, the core network determines that the mobile terminal can not access the Home-eNB (A). In this embodiment, for example, the method disclosed in the fifth embodiment is used. Even when the core network determines that the mobile terminal can not access the Home-eNB (A), the white list of the mobile terminal is sent to the Home-eNB (A) in ST 3210 before transmitting the TAU reject. Send Home-eNB (A) which received the white list of this mobile terminal transmits a white list with respect to this mobile terminal by ST321.

  Here, the mobile terminal that has received the whitelist transmits an Ack of whitelist reception success to the Home-eNB (A) in ST 3212. This Ack may be a NAS message. Home-eNB (A) which received Ack of the white list reception success from said mobile terminal transmits Ack of the white list reception success with respect to core network by ST3213. The core network that has received the whitelist reception success Ack is information for notifying that the mobile terminal has completed the user access registration to the Home-eNB (C) to which the mobile terminal has registered the user access in ST 3215. Send On the other hand, the mobile terminal stores the received whitelist in its own mobile terminal in ST 3214. The core network that has received the whitelist reception success Ack in ST 3213 transmits a TAU reject message for the TAU request to the mobile terminal via the Home-eNB (A) in ST 3216 and ST 3217. The mobile terminal that has received the TAU reject message releases an RRC connection with the Home-eNB (A) in ST3218.

  The mobile terminal that has failed to receive the whitelist in ST 3211 transmits Nack of whitelist reception failure to the Home-eNB (A) in ST 3212. This Nack may be a NAS message. Home-eNB (A) which received Nack of a whitelist reception failure from this mobile terminal transmits Nack of a whitelist reception failure with respect to a core network by ST3213. The core network that has received the whitelist reception failure Nack transmits the whitelist to the mobile terminal via the Home-eNB (A) in ST 3210 and ST 3211 again. Such processing is repeated until the mobile terminal successfully receives the whitelist. If the mobile terminal successfully receives, the mobile terminal performs processing of ST 3212 and subsequent steps. By adopting such a method, it is possible to greatly reduce the probability that the mobile terminal erroneously receives the content of the whitelist transmitted from the core network. Therefore, in the situation where there are a large number of CSG cells as described above, the mobile terminal selects a CSG cell belonging to the CSG-ID of the incorrectly received whitelist, and repeatedly RRCs to the CSG cell It is possible to solve the problem of establishing a connection and repeating the TAU request to the core network through the CSG cell. By solving these problems, it is possible to eliminate an extreme decrease in radio resource usage efficiency and signaling efficiency in future system operation.

  Although the fourth to eleventh embodiments of the present invention have been described for the registration of the whitelist, the present invention can be applied not only to the registration of the whitelist but also to the update (including deletion and addition) of the whitelist. Although the examples of Embodiments 1 to 11 in the present invention show the communication system using the LTE scheme in which the Home-eNB is used as the CSG cell, even in the case of the communication system in the UMTS scheme in which the Home-NB is used as the CSG cell It is applicable. In the case of a UMTS communication system in which Home-NB is used as a CSG cell, an RNC is provided between the base station (Home-NB, NB) and the core network, and RRC messages such as RRC connection request are between the mobile terminal and the RNC Transmission and reception may be performed, and NAS messages such as a TAU request may be transmitted and received from the mobile terminal to the core network via the base station (Home-NB, NB) and the RNC. By doing this, it becomes possible to apply also in the case of a UMTS communication system in which Home-NB is used as a CSG cell.

Embodiment 12
Non-Patent Document 6 discloses a procedure as RRC mobile communication system of RRC connection re-establishment (RRC (Radio Resource Control) connection re-establishment). FIG. 34 shows a flow of processing as a mobile terminal according to RRC connection re-establishment disclosed in FIG. The mobile terminal, in step ST3301, determines whether it has detected a radio link failure. As a result, when wireless link failure is detected, the process proceeds to step ST3305, and when not detected, the process proceeds to step ST3302. The mobile terminal, in step ST3302, determines whether or not a handover failure has occurred. As a result, when the handover fails, the process proceeds to step ST3305, and when the handover does not fail, the process proceeds to step ST3303. The mobile terminal, in step ST3303, determines whether or not there is an instruction from a layer with lower integrity failure. As a result, if there is an instruction of integrity failure, the process proceeds to step ST3305, and if there is no instruction, the process proceeds to step ST3304. The mobile terminal, in step ST3304, determines whether or not RRC connection reconfiguration failure has occurred. As a result, when RRC connection reconfiguration failure occurs, the process proceeds to step ST3305, and when no failure occurs, the process proceeds to step ST3301. The mobile terminal that has returned to step ST3301 repeats the processing of step ST3301, step ST3302, step ST3303 and step ST3304. Further, the order of the processes of step ST3301, step ST3302, step ST3303 and step ST3304 is arbitrary, and may be simultaneous.

  The radio link failure in which the mobile terminal determines the presence or absence of detection in step ST3301 will be described below. After detecting the physical layer problem, the time to allow the radio link recovery (Radio link recovery) is assumed to be, for example, T310. Instead of T310, it is also possible to define a counter value of Physical layer failure from detection of physical layer problem until radio link recovery is permitted. Also, after the random access problem indicator from the MAC is received, the time to allow radio link recovery is, for example, T312.

  The mobile terminal detects a radio link failure when the timer (T310, T312) ends. The above timer (T310, T312) is a system information block type 2 (System) as a part of the mobile station timer and constant information elements (UE-Timer And Constants information element) when the base station (network side) is a mobile terminal. Information Block Type 2: It is mapped to SIB 2) and notified on PDSCH (DL-SCH) using BCCH.

  The handover failure determined by the mobile terminal in step ST3302 will be described below. The mobile terminal performs handover by receiving an RRC message that triggers handover. When mobility control information (Mobility Control information) is included in RRC connection reconfiguration (RRC Connection Reconfiguration message), the mobile terminal sets a timer (for example, T304) included in the mobility control information. The mobile terminal stops the timer (T304) when the MAC completes the random access procedure. The mobile terminal determines that the handover has failed when the timer (T304) ends. That is, the timer (T304) defines an allowable time required for the MAC to complete the random access procedure after starting the execution of the handover. Note that the timer (T304) is mapped to the RRC connection reconfiguration message (RRC Connection Reconfiguration message) as a part of mobility control information element by the base station (network side) as a mobile terminal. , NAS notification (NAS (Non Access Stratum) Dedicated information) as notification.

  The RRC connection reconfiguration failure determined by the mobile terminal in step ST3304 will be described below. When the configuration incapable of the UE is included in the RRC connection reconfiguration message, it is determined that the RRC connection reconfiguration failure. The base station (network side) notifies the mobile terminal of the RRC connection reconfiguration message as NAS individual information. After detecting the physical layer problem in step ST3305, the mobile terminal stops the timer for the time (T310) allowing radio link recovery, and moves on to step ST3306. After receiving the random access problem indicator from the MAC in step ST3306, the mobile terminal stops the timer for the time (T312) allowing radio link recovery, and moves to step ST3307. In step ST3307, the mobile terminal is allowed to select a cell in E-UTRA based on detection of radio link failure, determination of handover failure, determination of integrity failure, or determination of RRC connection reconfiguration failure. A timer (for example, T311) of time is started, and the process proceeds to step ST3308. Note that the above-mentioned timer (T311) is a system where the base station (network side) is a mobile terminal and as part of the timer and constant information elements (UE-Timer And Constants information element) of the mobile terminal, System Information Block Type 2 : Mapped to SIB 2) and notified on PDSCH using BCCH. The mobile terminal resets MAC (Media Access Control) in Step ST3308, and moves to Step ST3309. The mobile terminal resets RLC (Radio Link Control) of all the set radio bearers (Radio Bearers: RB) in Step ST3309, and moves to Step ST3310.

  The mobile terminal, in step ST3310, determines whether the T311 timer has not ended. As a result, if the timer has ended (timeout, timer completed, timer expired), the process proceeds to step ST3311, and if not completed, the process proceeds to step ST3314. The mobile terminal, in step ST3311, resets the RLC reconfiguration of all radio bearers set to MAC, and moves to step ST3312. The mobile terminal releases all radio resources in step ST3312, and proceeds to step ST3313. A mobile terminal changes to a RRC_IDLE state in step ST3313. The mobile terminal, in step ST3314, determines whether it has selected an E-UTRA cell, also referred to as a cell selection process or a cell reselection process. As a result, when an E-UTRA cell is selected, the process proceeds to step ST3315, and when an E-UTRA cell is not selected, the process proceeds to step ST3317. The mobile terminal stops the timer T311 in step ST3315, and proceeds to step ST3316. The mobile terminal, in step ST3316, transmits an RRC connection reestablishment request message (RRC connection Reestablishment request message) to the network side. In step ST3317, the mobile terminal determines whether or not the different radio access technology cell (inter-RAT (Radio Access Technology Cell) has been selected) according to the cell selection procedure. As a result, when the inter-RAT cell is selected, the process proceeds to step ST3311 If it moves and does not select the inter-RAT cell, it moves on to step ST3310.The mobile terminal that has returned to step ST3310 repeats the process of step ST3310, step ST3314 and step ST3317.

  The problems in the twelfth embodiment will be described below. As mentioned above, CSG cells are introduced in LTE and UMTS. However, the procedure as a mobile communication system of RRC connection re-establishment in Non-Patent Document 6 does not disclose how to introduce a CSG cell. Further, there is no suggestion as to the problem pointed out in the twelfth embodiment. In order to receive normal service in a CSG cell, the mobile terminal needs to register in the CSG cell. After completing the registration, the mobile terminal stores the CSG-ID of the CSG cell registered in the whitelist present in the mobile terminal (USIM, SIM, memory, CPU, etc.). The CSG cell broadcasts a CSG-ID or a tracking area code (TAC) associated with the CSG-ID as a system information (System information) to a mobile terminal being served thereby. CSG-ID or TAC is mapped to System Information Block Type 1 (SIB 1), and broadcast from CSG cell by PDSCH using BCCH. In addition, the cycle in which SIB1 is notified is once in 20 ms. In order for the UE to select a CSG cell as a suitable cell and to perform location registration or waiting for normal service, as compared to the case where a non-CSG cell is selected as a suitable cell It is necessary to additionally perform processing to determine whether the mobile terminal is registered in the CSG cell. In order to determine whether or not the mobile terminal is registered in the CSG cell, whether or not the CSG-ID (or TAC) reported by the CSG cell is the same as the CSG-ID in the white list in the mobile terminal. You need to judge.

  The RRC connection re-establishment procedure at the time of introducing a CSG cell is shown. The procedure is substantially the same as that of FIG. 33, but details of the characteristic step ST3314 are shown in FIG. The mobile terminal, in step ST3401, determines whether the whitelist includes the CSG-ID. Alternatively, the mobile terminal determines whether it is registered in the CSG cell. When CSG-ID is included in the white list or when registered in the CSG cell, the mobile terminal makes a transition to step ST3402. When CSG-ID is not included in the whitelist or when it is not registered in the CSG cell, the mobile terminal makes a transition to step ST3410. The mobile terminal, in step ST3402, determines whether or not there is a cell that can be a serving cell in the CSG cell based on the measurement result of the reception quality of the neighboring cell (Neighboring Cell). When it exists, it transfers to step ST3403. If it does not exist, the process proceeds to step ST3410. In step ST3403, the mobile terminal selects the best cell (also referred to as best cell) based on the reception quality among the cells that can be the serving cell in the CSG cell based on the measurement result of the reception quality of neighboring cells, It transfers to step ST3404.

  The mobile terminal, in step ST3404, receives the physical downlink control channel (Physical downlink control channel: also called PDCCH, L1 / L2 signaling channel) of the cell selected in step ST3403. In order to receive PDCCH, the mobile terminal needs to perform blind detection processing. As a result of blind detection, the assignment of BCCH on PDSCH is received, and the process moves to Step ST3405. The mobile terminal, in step ST3405, receives the PDSCH in accordance with the assignment for BCCH received in step ST3404 and moves to step ST3406. In PDSCH, BCCH to which SIB1 is mapped is transmitted once every 20 ms. The mobile terminal obtains SIB1 in step ST3405. The mobile terminal, in step ST3406, acquires the CSG-ID or TAC mapped to the SIB1 received in step ST3405, and proceeds to step ST3407. Although CSG-ID may be mapped to system information other than SIB1, it is possible to apply the present embodiment even in that case.

  The mobile terminal, in step ST3407, determines whether or not the CSG-ID of the CSG cell obtained in step ST3406 and the CSG-ID of the registered CSG cell stored in the white list of the mobile terminal are the same. . Thus, the mobile terminal determines whether the CSG cell can be a "suitable cell". That is, when CSG-ID of the said CSG cell exists in a whitelist, the said cell may turn into a "suitable cell (suitable cell)" as a registered CSG cell. Conversely, if the CSG-ID of the CSG cell is not present in the whitelist, the cell can not be a "suitable cell" as a non-registered CSG cell. When the said CSG cell is a registered CSG cell, it transfers to step ST3315 of FIG. When the CSG cell is not registered, the mobile terminal makes a transition to step ST3408.

  The mobile terminal omits the CSG cell from the process of E-UTRA cell selection in step ST3408, and moves to step ST3409. The mobile terminal, in step ST3409, determines whether the T311 timer has not ended. As a result, if the timer has ended (timeout, timer completed, timer expired), the process proceeds to step ST3311 of FIG. 33, and if not completed, the process returns to step ST3402. The mobile terminal, in step ST3410, determines whether there is a cell that can be a serving cell in the non-CSG cell based on the measurement result of the reception quality of the neighboring cell (Neighboring Cell). If it exists, the process proceeds to step ST3411. If it does not exist, the process proceeds to step ST3317 of FIG. The mobile terminal, in step ST3411, selects the best cell based on the reception quality among the cells that can be the serving cell in the non-CSG cell based on the measurement result of the reception quality of the neighboring cells, and moves to step ST3315 in FIG. Do.

  As apparent from the above and FIG. 34, the time required for E-UTRA cell selection for a mobile terminal including a CSG-ID in the whitelist, that is, a mobile terminal registered in any one CSG cell, is CSG-ID in the whitelist. It can be seen that there is a possibility that the mobile terminal not including H, that is, the mobile terminal not registered in any CSG cell may take a longer time to select an E-UTRA cell. Although this phenomenon is registered in the CSG cell (assuming CSG-ID = 10) in the mobile terminal itself, this phenomenon is more noticeable than in the case where the CSG cell (CSG-ID = 10) does not exist in the periphery. In this case, the mobile terminal determines in step ST3407 in FIG. 34 that the CSG cell is “unregistered CSG cell”. Furthermore, when the mobile terminal exists in a place where many CSG cells to which the mobile terminal is not registered exist, and the reception quality of many CSG cells not registered is good and can be a serving cell, the above problem Is more pronounced. In this case, the processing from step ST3402 to step ST3409 in FIG. 34 is repeated until there is no cell that can be a serving cell in the CSG cell.

  The following problems occur from the difference in time required for cell selection between a mobile terminal having a CSG-ID in the whitelist and a mobile terminal not having the CSG-ID in the whitelist. As described above, the allowable time for selecting a cell in E-UTRA from detection of radio link failure, judgment of handover failure, judgment of integrity failure, or judgment of RRC connection reconfiguration failure Timer (eg, T311) is present. In the case where the above timer is one type as it is at present, a case will be considered in which the timer value is adapted to the mobile terminal having the CSG-ID in the whitelist. In that case, since the CSG-ID is not included in the whitelist, the timer does not time out although the time required for cell selection is relatively short. That is, in step ST3310 of FIG. 33, the determination "the timer has ended" is unnecessarily delayed. This means that all radio resource (radio resource) release performed in step ST3312 of FIG. 33 is unnecessarily delayed. Therefore, the problem of securing unnecessary radio resources occurs. Conversely, consider the case where the timer value is adapted to a mobile terminal that does not have a CSG-ID in the whitelist. In that case, in order to have the CSG-ID in the whitelist, the time required for cell selection is long, but the timer may be in the middle of cell selection, for example, although there may still be cells that can be serving cells in the CSG cell. May time out.

  That is, there may be a case where the determination "the timer has ended" in step ST3310 in FIG. 33 or the determination "the timer has ended" in step ST3409 in FIG. 34 is too early. Although this raises the MAC of the mobile terminal having the CSG-ID in the whitelist, the problem of reducing the possibility of RRC connection reestablishment in a state where the radio bearer, that is, the radio resource is secured, occurs. This causes a problem that a mobile terminal having a CSG-ID in the whitelist transitions to the RRC_IDLE state and a control delay occurs despite the presence of a cell with good reception quality in the vicinity. Note that Non-Patent Document 6 does not suggest this problem. Further, FIG. 34 describes the case where the CSG cell selection is performed with higher priority than the non-CSG cell selection. However, even if there is no priority, the above problem occurs. Furthermore, this subject arises in CSG cell introduction to a LTE (E-UTRAN) system, and CSG cell introduction to a W-CDMA (UTRAN, UMTS) system.

  The solution to the problem of the twelfth embodiment is shown below. The solution is applicable to both LTE and W-CDMA systems. In the twelfth embodiment, in order to solve the above problems, it is disclosed to separately provide different timers depending on whether or not they have CSG-ID in the whitelist, and reflect them on the mobile terminal. More specifically, based on detection of radio link failure or judgment of handover failure or judgment of integrity failure or judgment of RRC connection reconfiguration failure depending on whether or not the CSG-ID is included in the whitelist. It discloses that a timer (for example, T311) of an allowance time until selecting a cell in UTRA is provided separately (for example, with T311_whitelist and without T311_whitelist) and reflected to the mobile terminal.

  A specific operation example will be described using FIG. In FIG. 35, the description of the same step numbers as in FIG. 33 will be omitted. Note that FIG. 34 can also be used in FIG. The mobile terminal, in step ST3501, determines whether or not the white list includes the CSG-ID. Alternatively, the mobile terminal determines whether it is registered in the CSG cell. When CSG-ID is included in the whitelist or when registered in the CSG cell, the mobile terminal makes a transition to step ST3502. When CSG-ID is not included in the whitelist or when not registered in the CSG cell, the mobile terminal makes a transition to step ST3503. In step ST3502, the mobile terminal is allowed to select a cell in E-UTRA from detection of radio link failure or judgment as handover failure, or judgment as integrity failure, or judgment as RRC connection reconfiguration failure. Detection of radio link failure, judgment of handover failure, or judgment of integrity failure for the case where CSG-ID is included in the white list in the timer (for example, T311) or registered in the CSG cell Alternatively, a timer (for example, T311_white list present) of an allowance time until selection of a cell in E-UTRA is determined after judgment of RRC connection re-establishment failure, and the process moves to Step ST3307.

  In step ST3503, the mobile terminal is allowed to select a cell in E-UTRA from detection of radio link failure or judgment as handover failure, or judgment as integrity failure, or judgment as RRC connection reconfiguration failure. Detection of radio link failure, judgment of handover failure, or judgment of integrity failure for cases where CSG-ID is not included in the whitelist or is not registered in the CSG cell in the timer of time (for example, T311) Alternatively, the timer (for example, T311_white list not present) of the allowable time until the cell in E-UTRA is selected from the judgment of RRC connection re-establishment failure is set, and the process moves to Step ST3307.

  Next, a notification method of timers separately provided with different timers depending on whether or not they have CSG-ID in the whitelist will be disclosed. As a first method, a timer used when CSG-ID is included in the white list (for example, T311_white list included), and a timer used when CSG-ID is not included in the white list (for example, T311_white list absent) Both serving cell (network side) notify the mobile terminal. More specifically, notification is performed using a dedicated control channel (DCCH) or a broadcast control channel (BCCH). The use of an individual control channel is an excellent method in that control can be performed according to the communication state of the mobile terminal. Also, in the case of using the BCCH, it is possible to notify all mobile terminals under its control, which is an excellent method in terms of effective use of radio resources. As a specific example in the case of notification using BCCH, mapping to MIB or SIB can be considered. When the MIB is used, the MIB is mapped to the PBCH, which is an excellent method in that the mobile terminal can receive less control delay. When using SIB, it notifies using SIB1. MIB or SIB1 is an excellent method in that it reduces the control delay of the mobile terminal in that it is broadcast information that is minimally received for the operation of waiting for a cell search. Also, it is mapped to system information block type 2 (System Information Block Type 2: SIB2) as part of UE-Timer And Constants information element of mobile terminal timer and Constant, and notified on PDSCH using BCCH. . Furthermore, regardless of whether the serving cell is a CSG cell or a non-CSG cell, a timer used when CSG-ID is included in the white list (eg, T311_white list included), CSG-ID not included in white list The serving cell (network side) serves as a part of the timer and constant information elements (UE-Timer and Constants information element) of the mobile terminal for both the timer (eg T311 _ white list absent) used by the mobile terminal. BlockType2: mapped to SIB2) and notified on PDSCH using BCCH. The use of the SIB 2 is an excellent method in that it can be notified simultaneously with the same (same type) parameters from the viewpoint of a timer, and the processing of the received mobile terminal is easy. Furthermore, even the method of notifying by system information other than SIB1 and SIB2 is broadcast information, it can be notified to all mobile terminals under its control, which is an excellent method in terms of effective use of radio resources. In the first method, since the mobile terminal can obtain different timers only by receiving the BCCH or DCCH of the serving cell, it is possible to obtain the effect of preventing control delay.

  As a second method, a timer (for example, T311_whitelist absent) used when the whitelist does not have a CSG-ID is a mobile terminal's serving cell (network side) 's mobile terminal timer and a constant information element ( It is mapped to the system information block type 2 as part of UE-Timer and Constants information element), and notified on PDSCH using BCCH. Furthermore, regardless of whether the serving cell is a CSG cell or a non-CSG cell, the serving cell (network side) serves as a mobile terminal when the serving cell (network side) uses a timer (for example, no T311_whitelist) used when the whitelist does not have a CSG-ID. It is mapped to the system information block type 2 as part of the timer and the constant information element, and notified on PDSCH using BCCH. The CSG cell maps the mobile terminal to the system information and notifies the PDSCH using the BCCH when the timer has a CSG-ID in the white list (for example, T311_white list present).

  A specific operation example will be described using FIG. 36 and FIG. The description of the same step numbers as in FIGS. 33 and 35 in FIG. 36 and the same step numbers as in FIG. 34 in FIG. 37 will be omitted. The mobile terminal, in step ST3601 of FIG. 36, determines whether the serving cell is a CSG cell. When a serving cell is a CSG cell, it transfers to step ST3502. When a serving cell is not a CSG cell, it transfers to step ST3503. In step ST3502 of FIG. 36, the mobile terminal sets T311_white list present (T311 received from the CSG cell (serving cell)) to T311. The mobile terminal, in step ST3503 of FIG. 36, sets T311 without white list (T311 received from a non-CSG cell (serving cell)) to T311. In step ST3701 of FIG. 37, the mobile terminal determines whether a timer (for example, T311_white list included) used when TSG has a CSG-ID in T311 is set. If T311_whitelist presence is set, the process proceeds to step ST3407. When T311_whitelist presence is not set, the process proceeds to step ST3702.

  The mobile terminal, in step ST3702 of FIG. 37, acquires T311_WhiteList from the system information mapped to the BCCH on the PDSCH received in step ST3405, and moves on to step ST3703. The mobile terminal, in step ST3703 in FIG. 37, selects a cell in E-UTRA from detection of radio link failure or judgment as handover failure, or judgment as integrity failure, or judgment as RRC connection reconfiguration failure. Detection of radio link failure, judgment as handover failure, or integrity failure for the case where CSG-ID is included in the white list in the timer (for example, T311) in the allowable time up to (or T311), or when registering in a CSG cell And a timer (for example, with T311_white list) for setting an allowable time until selecting a cell in E-UTRA based on the determination of either of the above and the determination of RRC connection re-establishment failure, and moves on to step ST3407. According to the second method, it is possible to obtain an effect that it is not necessary to change the system information of the non-CSG cell due to the introduction of CSG. This eliminates the need for changes in the existing CSG-free LTE system (eUTRA / eUTRAN), and improves compatibility. In the second method, the method of notifying the timer (for example, T311_white list included) used when the white list has CSG-ID in the system information mapped to the BCCH on the PDSCH has been specifically described. Also in the case of the second notification method, as in the first notification method, an individual control channel and a broadcast control channel (MIB, SIB) can be used as in the first notification method.

  The effects of the twelfth embodiment are shown below. Under the umbrella of the base station, there may be a mixture of mobile terminals having a CSG-ID in the whitelist and mobile terminals not having the CSG-ID in the whitelist. Detection of radio link failure, judgment of handover failure or judgment of integrity failure separately for mobile terminals having CSG-ID in whitelist and mobile terminals not having CSG-ID in whitelist Alternatively, it is possible to set a timer (for example, T311) of an allowance time until the cell in the E-UTRA is selected from the judgment of the RRC connection reconfiguration failure. As a result, it becomes possible to set the timer value appropriately for the mobile terminal having the CSG-ID in the whitelist and for the mobile terminal not having the CSG-ID in the whitelist. Therefore, it is possible to avoid securing unnecessary radio resources due to the timer being set long, and it is possible to obtain an effect of effective use of the radio resources. In addition, it is possible to obtain an effect of avoiding an increase in control delay as the mobile communication system by setting the timer short. The prevention of control delay can also be obtained together with the effect of reducing the power consumption of the mobile terminal.

  The solution of Embodiment 12 is excellent in that the network side (such as a base station) does not know whether the mobile terminal has the CSG-ID in the whitelist or not but has the above effect. . By this, it is not necessary to notify the presence or absence of CSG-ID in the whitelist from the mobile terminal to the base station, and radio resources can be effectively used. In addition, since the base station does not need to manage the presence or absence of the CSG-ID in the whitelist of the mobile terminals being served thereby, the effect of reducing the processing load of the base station can be obtained.

Thirteenth Embodiment
Non-Patent Document 7 discloses that different priorities of E-UTARAN frequency or Inter-RAT frequency in LTE mobile communication system are provided from the network side to UE in System information and RRC message. ing. If priorities are assigned from the network side to the mobile terminal via Dedicated Signaling, the mobile terminal ignores all priorities provided by the system information. Non-Patent Document 6 describes the following. The RRC connection release message (RRC Connection Release message) includes idle mode mobility control information (idle mode Mobility Control Info), and the idle mode mobility control information includes a cell reselection priority expiration timer (cell Reselection Priority Expiry Timer). If (for example, T320) is included, the following operation is performed as a mobile communication system. FIG. 39 shows the flow of processing as a mobile terminal disclosed in FIG. 38. The mobile terminal, in step ST3801, receives different E-UTRAN frequency or inter-RAT frequency priorities in the system information transmitted from the base station, and moves on to step ST3802. The mobile terminal, in step ST3802, determines whether or not different E-UTRAN frequencies or inter-RAT frequency priorities have been received by using dedicated signals transmitted from the base station. When it receives, it transfers to step ST3803. When not receiving, it transfers to step ST3804. A mobile terminal reselects a cell according to the priority received with system information in step ST3803.

  The mobile terminal reselects the cell according to the priority received in the individual signal in step ST3804 and moves to step ST3805. The mobile terminal, in step ST3805, determines whether it has left the PLMN for which the priority has been set by the individual signal. When leaving, it transfers to step ST3808. When not separated, it transfers to step ST3806. The mobile terminal, in step ST3806, determines whether it has transitioned to the RRC connected state. If there is a transition, the process proceeds to step ST3808. When not transitioning, it transfers to step ST3807. The mobile terminal, in step ST3807, determines whether or not the timer T320 has ended. If it has ended, the process transitions to step 3808. If not completed, the process returns to step ST3804 and repeats the processes of steps ST3804 to ST3807. In addition, the order of the processes from step ST3804 to step ST3807 is arbitrary, and may be simultaneous.

  The problems in the thirteenth embodiment will be described below. As mentioned above, CSG cells are introduced in LTE and UMTS. Mobile terminals that have not been registered in any CSG cell, that is, mobile terminals that do not have CSG-ID in the whitelist, target only non-CSG cells for cell reselection. A mobile terminal already registered in any CSG cell, that is, a mobile terminal having a CSG-ID in the whitelist, targets not only non-CSG cells but also CSG cells for reselection. Furthermore, studies on CSG dedicated frequencies (frequency layers) in which only CSG cells are present are underway. Therefore, a mobile terminal not registered in the CSG cell (a mobile terminal having no CSG-ID in the white list) and a mobile terminal registered in any CSG cell (a mobile terminal having the CSG-ID in the white list) When the same priority (different E-UTRAN frequency or inter-RAT frequency priority) is set to, the mobile communication system has problems such as increase in control delay. Furthermore, this subject occurs in CSG cell introduction to LTE (E-UTRAN) system and in CSG cell introduction to W-CDMA (UTRAN, UMTS) system.

  The solution to the problem of the thirteenth embodiment will be shown below. The solution is applicable to both LTE and W-CDMA systems. In the thirteenth embodiment, different priorities (such as different E-UTARAN frequencies or inter-RAT frequency priorities) are separately provided depending on whether or not the whitelist has a CSG-ID in order to solve the above problems. , To be reflected in the mobile terminal. A specific operation example will be described with reference to FIG. In FIG. 39, the description of the parts with the same step numbers as in FIG. In step ST3901, the mobile terminal is a priority (different E-UTRAN frequencies) for mobile terminals (for registered mobile terminals in a CSG cell) having a CSG-ID in the whitelist transmitted as system information from the base station. Alternatively, the priority of the inter-RAT frequency) and the priority of the mobile terminal (for unregistered mobile terminal in CSG cell) having no CSG-ID in the whitelist are received, and the process moves to Step ST3802. The mobile terminal, in step ST3902, determines whether the whitelist includes the CSG-ID. Alternatively, the mobile terminal determines whether it is registered in the CSG cell. When CSG-ID is included in the white list or when registered in the CSG cell, the mobile terminal makes a transition to step ST3903. When CSG-ID is not included in the whitelist or when not registered in the CSG cell, the mobile terminal makes a transition to step ST3904. A mobile terminal reselects a cell according to the priority order for mobile terminals (for the registered mobile terminal to a CSG cell) which has CSG-ID in the whitelist received by system information in step ST3903. A mobile terminal reselects a cell according to the priority of the mobile terminal (For unregistered mobile terminal to a CSG cell) which does not have CSG-ID in the whitelist received by system information in step ST3904.

  The mobile terminal, in step ST3905, determines whether the whitelist includes the CSG-ID. Alternatively, the mobile terminal determines whether it is registered in the CSG cell. When CSG-ID is included in the white list or when registered in the CSG cell, the mobile terminal makes a transition to step ST3906. When CSG-ID is not included in the whitelist or when not registered in the CSG cell, the mobile terminal makes a transition to step ST3907. The mobile terminal reselects a cell according to the priority for mobile terminals (for registered mobile terminals in CSG cells) having CSG-ID in the whitelist received in the individual signal in step ST3906, and step ST3805 Transition to In Step ST3907, the mobile terminal reselects a cell according to the priority for mobile terminals (for unregistered mobile terminals in CSG cells) having no CSG-ID in the whitelist received in the dedicated signal. It transfers to step ST3805. Here, the priority which differs depending on whether or not the CSG-ID is included in the whitelist may be either the priority notified in the system information or the priority notified in the individual signal.

  Next, as a system information (step ST3901), a notification method of priorities which differ depending on whether or not the whitelist has a CSG-ID will be disclosed. As the first method, the serving cell (network side) serves as the mobile terminal for the system information in both the priority used when the CSG-ID is included in the whitelist and the priority used when the CSG-ID is not included in the whitelist. And notify on PDSCH using BCCH. Furthermore, regardless of whether the serving cell is a CSG cell or a non-CSG cell, the serving cell (network side) uses the BCCH as system information for the mobile terminal as the priority to be used when there is no CSG-ID in the whitelist. Notify on PDSCH. According to the first method, since the mobile terminal can obtain different priorities only by receiving the BCCH of the serving cell, the effect of preventing control delay can be obtained. As a second method, the serving cell (network side) notifies the mobile terminal of the priority used in the case where the whitelist does not have a CSG-ID via PDSCH using BCCH as system information. Furthermore, regardless of whether the serving cell is a CSG cell or a non-CSG cell, the priority used when the CSG-ID is included in the white list, and the priority used when the CSG-ID is not included in the white list are both serving cells. The (network side) notifies the mobile terminal on PDSCH using BCCH as system information. In the case where the CSG-ID is included in the whitelist, the CSG cell maps the mobile terminal to system information and notifies the PDSCH using the BCCH. It is possible to obtain an effect that it is not necessary to make a change due to the introduction of CSG into system information of non-CSG cells. This eliminates the need for changes in the existing CSG-free LTE system (eUTRA / eUTRAN), and improves compatibility.

  Next, when the CSG-ID is included in the whitelist notified to the mobile terminal from the base station (network side) by an individual signal, or when it is registered in the CSG cell, the CSG in the whitelist and the whitelist -An RRC message can be considered as a notification method of priority for the case where the ID is not included, or when not registered in the CSG cell.

  The effects of the thirteenth embodiment are shown below. Under the umbrella of the base station, there may be a mixture of mobile terminals having a CSG-ID in the whitelist and mobile terminals not having the CSG-ID in the whitelist. Separate priorities (such as different E-UTARAN frequencies or Inter-RAT frequency priorities) for mobile terminals with CSG-ID in the whitelist and mobile terminals without CSG-ID in the whitelist. It can be set. As a result, the mobile communication system has an effect of preventing an increase in control delay. The solution of Embodiment 13 is excellent in that the network side (such as a base station) does not know whether the mobile terminal has the CSG-ID in the whitelist or not but has the above effect. . By this, it is not necessary to notify the presence or absence of CSG-ID in the whitelist from the mobile terminal to the base station, and radio resources can be effectively used. In addition, since the base station does not need to manage the presence or absence of the CSG-ID in the whitelist of the mobile terminals being served thereby, the effect of reducing the processing load of the base station can be obtained.

Fourteenth Embodiment
The problems in the fourteenth embodiment will be described below. As described in the thirteenth embodiment, in the prior art, the priority (different E-UTRAN frequency or Inter-RAT frequency priority) notified from the network side (base station) to the mobile terminal by the individual signal is effective. The time was one kind. As mentioned above, CSG cells are introduced in LTE and UMTS. Mobile terminals that have not been registered in any CSG cell, that is, mobile terminals that do not have CSG-ID in the whitelist, target only non-CSG cells for cell reselection. Therefore, the change of priority is considered to be small. A mobile terminal already registered in any CSG cell, that is, a mobile terminal having a CSG-ID in the whitelist, targets not only non-CSG cells but also CSG cells for reselection. Therefore, priority changes are considered to be frequent. As described above, in a situation where the priority change frequency is different, if the priority valid time is one type, it is impossible to set the valid time to match each status change, and the control delay increases. There is a problem of Furthermore, this subject occurs in CSG cell introduction to LTE (E-UTRAN) system and in CSG cell introduction to W-CDMA (UTRAN, UMTS) system.

  The solution to the problem of the fourteenth embodiment is shown below. The solution is applicable to both LTE and W-CDMA systems. In the fourteenth embodiment, in order to solve the above problems, effective times (for example, different E-UTRAN frequency or inter-RAT frequency priorities) effective times (for example, different E-UTRAN frequency or inter-RAT frequency priorities) depending on whether or not a CSG-ID is included in the whitelist. It is disclosed that T320) is provided separately and reflected on the mobile terminal. A specific operation example will be described with reference to FIG. In FIG. 40, the description of the same step numbers as in FIG. 38 will be omitted. The mobile terminal, in step ST4001, determines whether the whitelist includes the CSG-ID. Alternatively, the mobile terminal determines whether it is registered in the CSG cell. When CSG-ID is included in the white list or when registered in the CSG cell, the mobile terminal makes a transition to step ST4002. When CSG-ID is not included in the whitelist or when not registered in the CSG cell, the mobile terminal makes a transition to step ST4003. When the mobile terminal includes CSG-ID in the white list in the valid time (for example, T320) of the priority (different E-UTRAN frequency or inter-RAT frequency priority) in step ST4002, or in the CSG cell The valid time (for example, with T320_whitelist) of priority for different registration (different E-UTRAN frequency or inter-RAT frequency priority) is set, and the process moves to Step ST3807.

  If the mobile terminal does not include the CSG-ID in the whitelist in the valid time (for example, T320) of the priority (different E-UTRAN frequency or inter-RAT frequency priority) in step ST4003, or the CSG cell The valid time (for example, T320_whitelist nothing) of the priority (for different E-UTRAN frequencies or the priority of the Inter-RAT frequency) for not registered is set, and the process moves to Step ST3807. If CSG-ID is included in the whitelist or if it is registered in the CSG cell, and if the CSG-ID is not included in the whitelist or is not registered in the CSG cell As a notification method of the priority effective time for the case, an RRC message and a broadcast control channel can be considered. The use of an individual control channel is an excellent method in that control can be performed according to the communication state of the mobile terminal. In the case of notifying by a broadcast control channel, it can be notified to all mobile terminals under its umbrella, which is an excellent method in terms of effective utilization of radio resources. The fourteenth embodiment can be used together with the thirteenth embodiment. In that case, if the whitelist includes the CSG-ID, or if the whitelist does not contain the CSG-ID, or if the whitelist does not include the CSG-ID, or if the whitelist does not include the CSG-ID, or The notification method of the priority effective time for the case where it does not have can be considered an RRC message and a broadcast control channel. In the case of notifying by the RRC message, it may be considered to notify together with the priority notified by the individual signal. When notifying by an RRC message, it is excellent in the point which can avoid the complexity of a mobile communication system in that priority and the effective time of the said priority can be notified by the same notification method. Furthermore, the control delay of the mobile communication system can be reduced by notifying both the priority and the effective time of the priority. In the case of notifying by a broadcast control channel, it can be notified to all mobile terminals under its umbrella, which is an excellent method in terms of effective utilization of radio resources.

  The effects of the fourteenth embodiment are shown below. Under the umbrella of the base station, there may be a mixture of mobile terminals having a CSG-ID in the whitelist and mobile terminals not having the CSG-ID in the whitelist. Different priorities (such as different E-UTARAN frequencies or Inter-RAT frequency priorities) for mobile terminals with CSG-ID in the whitelist and mobile terminals without CSG-ID in the whitelist Enabled time can be set. Thereby, the effective time of the priority can be set according to the frequency of the change of the priority. As a result, the mobile communication system has an effect of preventing an increase in control delay. The solution of the fourteenth embodiment is excellent in that the network side (such as a base station) has the above effect without grasping whether the corresponding mobile terminal has the CSG-ID in the whitelist. . By this, it is not necessary to notify the presence or absence of CSG-ID in the whitelist from the mobile terminal to the base station, and radio resources can be effectively used. In addition, since the base station does not need to manage the presence or absence of the CSG-ID in the whitelist of the mobile terminals being served thereby, the effect of reducing the processing load of the base station can be obtained. By using Embodiment 14 and Embodiment 13 together, the mobile terminal having the CSG-ID in the whitelist and the mobile terminal not having the CSG-ID in the whitelist are highly flexible and preferred. Rank setting becomes possible. As a result, the mobile communication system has an effect of preventing an increase in control delay.

Embodiment 15
Non-Patent Document 6 (Chapter 10.1.1.2) and Non-Patent Document 7 (Chapter 5.2.4.2) disclose procedures for Cell Reselection as an LTE mobile communication system. The matters disclosed below will be described. The mobile terminal in the RRC_IDLE state performs cell reselection. The mobile terminal measures the serving cell and neighbor cells to perform reselection. It is not necessary to indicate neighboring cells in the serving cell system information (for the purpose of mobile terminal searching and measuring cells). If the serving cell's characteristics meet the search or metric, the measurement is omitted. The cell reselection authenticates the cell to be camped on by the mobile terminal. It is based on cell reselection criteria for measurement of the serving cell. Reselection between the same frequencies is based on the ranking of the cells. Reselection between different frequencies is based on the absolute priority that the mobile terminal attempts to camp on the highest available priority frequency. The absolute priority for reselection is provided only by the previously registered PLMN, RPLMN, and is valid only within the RPLMN. The priority is provided to system information and is valid for all mobile terminals in the cell (mobile terminals under the control of the cell). The special priority per mobile terminal may be notified in an RRC Connection Release message. The effective time can be linked to the priorities of the mobile terminals. It is possible to indicate layer-specific cell reselection parameters (e.g. layer-specific offset etc) for inter-frequency neighboring cells. These parameters are common to all adjacent cells on the frequency. The Neighbor Cell List (NCL) can be provided for the serving cell to handle special cases between the same frequency and between different frequencies. The neighbor cell list includes cell-specific cell reselection parameters (eg, cell-specific offsets) for specific neighbor cells. A blacklist can be provided so that the mobile terminal does not reselect adjacent cells between certain same frequencies and different frequencies. Cell reselection is speed dependent (can be speed dependent). Speed detection is based on the UTRAN solution. Although cell reselection parameters can be applied to all mobile terminals in one cell, it is also possible to set specific reselection parameters for each mobile terminal group and each mobile terminal.

  It shows the flow of processing as the mobile terminal disclosed in FIG. The mobile terminal, in step ST4101, selects a cell or reselects a cell, and proceeds to step ST4102. The mobile terminal, in step ST4102, determines whether the measurement criteria for starting cell reselection are satisfied. Specifically, it is determined whether the reception quality of the serving cell is equal to or less than a threshold. More specifically, it is determined whether S_ServingCell is less than or equal to S_intrasearch (or S_ServingCell is less than or equal to S_non intrasearch). If the measurement standard is satisfied, the process proceeds to step ST4103. If not satisfied, the process of step ST4102 is repeated. The mobile terminal, in step ST4103, performs measurement for cell reselection, and proceeds to step ST4104. The mobile terminal, in step ST4104, determines whether or not to perform cell reselection based on the result of the measurement performed in step ST4103. When cell reselection is performed, the process returns to step ST4101. If cell reselection is not performed, the process returns to step ST4102.

  CSG cells are introduced in LTE and UMTS. It is also considered that a cheaper charging system is set in the CSG cell as compared to the non-CSG cell. Therefore, it is expected that the user wishes to camp on the CSG cell in a place where the CSG cell can be selected. Also, in a situation where CSG cells exist within the coverage of non-CSG cells even as a mobile communication system, when the number of mobile terminals for which CSG cells are in charge of scheduling etc. increases, the processing load on non-CSG cells by that amount Is reduced. Therefore, it is also expected for the mobile communication system that a mobile terminal in a location where a CSG cell can be selected wants to camp on the CSG cell.

  The following problems occur in the cell reselection procedure described in Non-Patent Document 6 and Non-Patent Document 7 described above. Consider the case where a CSG cell is installed in a non-CSG cell. Also, consider a case where a mobile terminal in which the serving cell is a non-CSG cell is present in the coverage of the CSG cell. Under this circumstance, if the measurement criteria of the mobile terminal are not satisfied, if the reception quality of the serving cell (non-CSG cell) is greater than the threshold, and if S_ServingCell> S_intrasearch, then the mobile terminal does not perform measurement for cell reselection. It will be. In step ST4102 of FIG. 41, it is determined that the measurement standard is not satisfied, and step ST4102 is repeated without performing the process of step ST4103. This means that while the mobile terminal is within the coverage of the CSG cell, it is not given the opportunity to reselect the CSG cell. This causes the problem that the user can not benefit from the CSG cell charging plan. Also in the mobile communication system, there arises a problem that the load reduction of the non-CSG cell can not be achieved.

  The above problem is also disclosed in Non-Patent Document 8. Non-Patent Document 8 is a document for UTRA. Non-Patent Document 8 discloses the following method as a solution to the above problem. The mobile terminal should be able to search for the HNB even if the state of the serving cell is good (Sx> S_intrasearch, Sx> S_intersearch). The HNB search cycle in that case is expected to be longer than the search cycle normally used. The low power consumption of the mobile terminal is supported by not performing the search in the place where the HNB is not arranged. The method uses a search cycle longer than the usually used search cycle only when the presence of HNB is shown in the periphery in the neighboring cell list of the non-CSG cell.

  The problems in the fifteenth embodiment will be described below. Since Non-Patent Document 8 is a document for UTRA, the problem solution in EUTRAN (LTE system) is not disclosed in Non-Patent Document 8. Furthermore, Non-Patent Document 8 uses a neighboring cell list to support low power consumption of a mobile terminal. However, in the LTE system, as described above, it is not necessary for the mobile terminal to indicate neighboring cells in the serving cell system information for the purpose of searching and measuring cells. Therefore, it is impossible to apply the method for supporting low power consumption of the mobile terminal using the neighboring cell list shown in Non-Patent Document 8 to the LTE system as it is. Furthermore, as a new problem to the technology disclosed in Non-Patent Document 8, even if a CSG cell exists in a neighboring cell of the serving cell (non-CSG cell), the CSG cell is included in the white list of the mobile terminal. If not registered, the mobile terminal is not likely to select the CSG cell as a suitable cell. Therefore, the mobile terminal not registered in the CSG cell has a good serving cell state even though the CSG cell exists in the neighboring cell of the serving cell (non-CSG cell) using the technique of Non-Patent Document 8 (Sx> Even in the case of S_intrasearch, Sx> S_intersearch), consider the case where the search is started. In that case, since it is impossible for the mobile terminal (not registered in the CSG cell) to select a CSG cell, useless measurement will occur and a problem of increased power consumption of the mobile terminal will occur.

  The solution to the problem of the fifteenth embodiment is shown below. In the fifteenth embodiment, in order to solve the above problem, the CSG-ID is applied to the whitelist, and the state of the serving cell is good (Sx> S_intrasearch, Sx> S_intersearch) even when the cell reselection It discloses that a period (a timer may be used) for performing measurement for the purpose is provided and reflected on the mobile terminal. Alternatively, a period (may be a timer) to perform measurement for cell reselection even if the state of the serving cell is good (Sx> S_intrasearch, Sx> S_intersearch), which is applied when the mobile terminal is registered in the CSG cell , To be reflected in the mobile terminal. A specific operation example will be described using FIG. In FIG. 42, the description of the parts with the same step numbers as in FIG. 41 will be omitted. The mobile terminal, in step ST4201, determines whether the white list includes the CSG-ID. Alternatively, the mobile terminal determines whether it is registered in the CSG cell. When CSG-ID is included in the whitelist or when registered in the CSG cell, the mobile terminal makes a transition to step ST4202. When CSG-ID is not included in the whitelist or when not registered in the CSG cell, the mobile terminal makes a transition to step ST4207. A mobile terminal starts the measurement period for cell reselection applied, when CSG-ID is in a white list in step ST4202, or a timer (for example, T_reselectCSG), It transfers to step ST4203. Alternatively, a measurement cycle for cell reselection to be applied when the mobile terminal is registered in the CSG cell, or a timer (for example, T_reselect CSG) is started, and the process moves to Step ST4203.

  The mobile terminal, in step ST4203, determines whether or not it is a measurement cycle (for example, T_reselect CSG) for cell reselection to be applied when CSG-ID is included in the white list. Alternatively, the mobile terminal determines whether a timer for cell reselection (for example, T_reselect CSG) to be applied when CSG-ID is included in the white list has timed out (or has timed out). When it is a measurement period or when the timer times out, the process proceeds to step ST4205. If it is not the measurement cycle, or if the timer has not timed out, the process proceeds to step ST4204. The mobile terminal, in step ST4204, determines whether the measurement criteria for starting cell reselection are satisfied. Specifically, it is determined whether the reception quality of the serving cell is equal to or less than a threshold. More specifically, it is determined whether S_ServingCell is less than or equal to S_intrasearch (or S_ServingCell is less than or equal to S_non intrasearch). When the measurement standard is satisfied (when the reception quality of the serving cell is equal to or less than the threshold value, S_ServingCell ≦ S_intrasearch), the process proceeds to step ST4205. If not satisfied, the process returns to step ST4203. The mobile terminal, in step ST4205, performs measurement for cell reselection, and proceeds to step ST4206. The mobile terminal, in step ST4206, determines whether or not to perform cell reselection based on the result of the measurement performed in step ST4205. When cell reselection is performed, the process returns to step ST4101.

  When cell reselection is not performed, the process returns to step ST4202. The mobile terminal, in step ST4207, determines whether the measurement criteria for starting cell reselection are satisfied. Specifically, it is determined whether the reception quality improvement of the serving cell is less than or equal to a threshold. More specifically, it is determined whether S_ServingCell is less than or equal to S_intrasearch (or S_ServingCell is less than or equal to S_non intrasearch). If the measurement standard is satisfied, the process proceeds to step ST4208. If not satisfied, the process of step ST4207 is repeated. The mobile terminal, in step ST4208, performs measurement for cell reselection, and proceeds to step ST4209. The mobile terminal, in step ST4209, determines whether to perform cell reselection on the basis of the result of the measurement performed in step ST4208. When cell reselection is performed, the process returns to step ST4101. When cell reselection is not performed, the process returns to step ST4207.

  Next, the period when the measurement for cell reselection is performed (even with the timer) even if the serving cell state is good (Sx> S_intrasearch, Sx> S_intersearch), which is applied when the CSG-ID is included in the whitelist. A notification method of (for example, T_reselectCSG) is disclosed. As a first method, the serving cell (network side) notifies the mobile terminal of the broadcast information using the BCCH as the PBCH or PDSCH.

  Furthermore, the serving cell notifies on the PBCH using master information (MIB) or on the PDSCH using system information (SIB). When the MIB is used, the MIB is mapped to the PBCH, which is an excellent method in that the mobile terminal can receive less control delay. When using SIB, it notifies using SIB1. MIB or SIB1 is an excellent method in that it reduces the control delay of the mobile terminal in that it is broadcast information that is minimally received for the operation of waiting for a cell search. Furthermore, even the method of notifying by system information other than SIB1 is broadcast information, so it can be notified to all mobile terminals under its control, which is an excellent method in terms of effective use of radio resources. In the first method, the mobile terminal only receives the BCCH of the serving cell and applies when the CSG-ID is included in the whitelist, and the state of the serving cell is good (Sx> S_intrasearch, Sx> S_intersearch), Since it is also possible to obtain a cycle (timer) for performing measurement for cell reselection, it is possible to obtain an effect of preventing control delay. As a second method, the CSG cell notifies the mobile terminal of the broadcast information using the BCCH as the PBCH or PDSCH. Furthermore, the CSG cell notifies on PDSCH using PBCH using master information (MIB) or using system information (SIB). When the MIB is used, the MIB is mapped to the PBCH, which is an excellent method in that the mobile terminal can receive less control delay. When using SIB, it notifies using SIB1. MIB or SIB1 is an excellent method in that it reduces the control delay of the mobile terminal in that it is broadcast information that is minimally received for the operation of waiting for a cell search. Furthermore, even the method of notifying by system information other than SIB1 is broadcast information, so it can be notified to all mobile terminals under its control, which is an excellent method in terms of effective use of radio resources. It is possible to obtain an effect that it is not necessary to make a change due to the introduction of CSG into system information of non-CSG cells. This eliminates the need for changes in the existing CSG-free LTE system (eUTRA / eUTRAN) and improves compatibility. As a third method, a non-CSG cell notifies the mobile terminal of the broadcast information using the BCCH as the PBCH or PDSCH. Furthermore, the CSG cell notifies on PDSCH using PBCH using master information (MIB) or using system information (SIB). When the MIB is used, the MIB is mapped to the PBCH, which is an excellent method in that the mobile terminal can receive less control delay. When using SIB, it notifies using SIB1. MIB or SIB1 is an excellent method in that it reduces the control delay of the mobile terminal in that it is broadcast information that is minimally received for the operation of waiting for a cell search. Furthermore, a method of notifying by system information other than SIB1 may be used. Since system information other than SIB1 is also broadcast information, it can be notified to all mobile terminals under its umbrella, which is an excellent method in terms of effective use of radio resources. When the non-CSG cell is a serving cell, in order to be able to select a CSG cell, it is sufficient to notify the parameter from the non-CSG cell. Therefore, the third method is superior in terms of effective utilization of radio resources. A fourth method is a static value as the mobile communication system (a value known to a mobile terminal or a base station as a mobile communication system, a value described in a standard document, etc.). As a result, no radio signal is generated between the base station (network side) and the mobile terminal. Therefore, an effect can be obtained in terms of effective use of radio resources. Furthermore, since the value is determined statically, it is possible to obtain an effect of preventing the occurrence of a reception error of a wireless signal.

  In the above, provision is made of a period (timer) for performing measurement for cell reselection even when the state of the serving cell is good (Sx> S_intrasearch, Sx> S_intersearch), which is applied when CSG-ID is included in the whitelist. Although it has been disclosed that the mobile terminal is reflected, it is possible to solve the problem even if the whitelist separately provides different periods (timers) depending on whether or not the CSG-ID is included in the white list, and is reflected in the mobile terminal. In addition, in the above, the period for performing measurement for cell reselection even if the state of the serving cell is good (Sx> S_intrasearch, Sx> S_intersearch), which is applied when the CSG-ID is included in the whitelist (timer (timer) Although disclosed that the mobile terminal is provided and reflected in the mobile terminal, the period may be applied only when the serving cell is a non-CSG cell even if the mobile terminal has a CSG-ID in the white list. As a result, measurement for useless cell selection when the serving cell is already a CSG cell generated in the above solution (it is not necessary to change the serving cell from a non-CSG cell to a CSG cell, Even when the reception quality is good, it is possible to reduce the measurement for selecting a CSG cell). This can obtain the effect of reducing the power consumption of the mobile terminal. In the above, LTE using HeNB using CSG has been described, but the present invention is also referred to as UMTS using HNB using CSG, HeNB not using CSG, HNB, base station with a small radius (pico cell, macro cell Is also applicable.

  The effects of the fifteenth embodiment are shown below. Under the umbrella of the base station, there may be a mixture of mobile terminals having a CSG-ID in the whitelist and mobile terminals not having the CSG-ID in the whitelist. A cycle (may be a timer) to perform measurement for cell reselection is provided even when the serving cell state is good (Sx> S_intrasearch, Sx> S_intersearch), which is applied when the CSG-ID is included in the whitelist. By doing so, if the reception quality of the serving cell (non-CSG cell) is good, the user may benefit from the CSG cell's charging plan, which occurs because no measurement is performed to reselect the CSG cell. It is possible to solve the problem that it can not be done, and also the problem that the load reduction of non-CSG cells can not be achieved even in the mobile communication system. If the state of the serving cell is good if CSG-ID is included in the white list (if the measurement criteria are not satisfied, even if Sx> S_intrasearch, Sx> S_intersearch), measurement for cell reselection is performed, and the white list is selected. A mobile terminal that has not been registered in a CSG cell that does not have a CSG-ID has a good serving cell state as before (Sx> S_intrasearch, Sx> S_intersearch when no measurement criteria are met) Measurement for cell reselection Do not do. This makes it possible to omit the measurement for selecting a CSG cell even when the serving cell state is wasted for a mobile terminal that can not reselect the CSG cell because it is not registered in the CSG cell. . This can obtain the effect of reducing the power consumption of the mobile terminal not registered in the CSG cell. This effect is an effect according to the present invention which can not be obtained by the technique disclosed in Non-Patent Document 8. The solution of the fifteenth embodiment is excellent in that the problem can be solved without using the neighboring cell list. The reason is that, as described above, CSG cells, HeNBs, and HNBs assume portable sizes and weights, and it is assumed that installation and removal of these CSG cells and the like are performed frequently and flexibly. Therefore, in the solution using the neighboring cell list, the neighboring cell list needs to be updated each time the CSG cell, HeNB, HNB, etc. is installed or removed, and it is expected that the neighboring cell list will be updated frequently. . Therefore, the solution using the neighboring cell list is a complicated and complicated mobile communication system. Furthermore, the solution of the fifteenth embodiment is excellent in that the network side (such as a base station) does not know whether the mobile terminal has the CSG-ID in the whitelist or not but has the above effect. There is. By this, it is not necessary to notify the presence or absence of CSG-ID in the whitelist from the mobile terminal to the base station, and radio resources can be effectively used. In addition, since the base station does not need to manage the presence or absence of the CSG-ID in the whitelist of the mobile terminals being served thereby, the effect of reducing the processing load of the base station can be obtained.

  Next, a first modification of the fifteenth embodiment will be described. In the fifteenth embodiment, a cycle for performing measurement for cell reselection even if the state of the serving cell is good (Sx> S_intrasearch, Sx> S_intersearch), which is applied when the CSG-ID is included in the whitelist. The problem was solved by providing (a timer may be used) and reflecting it on the mobile terminal. However, it is unclear whether a CSG cell existing around the current serving cell can be a suitable cell (Suitable cell) even if it has a CSG-ID in the white list. When not registered in a CSG cell existing around the current serving cell, performing measurement for cell reselection even if the state of the serving cell is good increases the power consumption of the mobile terminal. The problem of that occurs. This is a problem that occurs when, for example, a user registered in a CSG cell installed in a company returns home.

  The problem solution in the first modification of the fifteenth embodiment is shown below. The first modification of the fifteenth embodiment is a case where the state of the serving cell is good (Sx> S_intrasearch, Sx> S_intersearch), which is applied when CSG-ID is included in the whitelist in order to solve the above problem. Even though the measurement for cell selection is performed in a cycle (may be a timer) at which measurement for cell reselection is performed, even if the state of the serving cell is good when the cell can not be selected. It is disclosed that an offset is added to a cycle for performing measurement for cell reselection and reflected on a mobile terminal. A specific operation example will be described using FIG. In FIG. 43, the description of the same step numbers as in FIG. 42 will be omitted. At step 4301, the mobile terminal adds an offset value to a period (timer) (eg, T_reselectCSG) at which measurement for cell reselection is performed even if the state of the serving cell is good (Sx> S_intrasearch, Sx> S_intersearch), It transfers to step ST4202. For example, if this offset value is a positive value, measurement is performed for cell reselection even if the serving cell state is good (Sx> S_intrasearch, Sx> S_intersearch) but cell reselection is not performed. In this case, that is, when a CSG cell to be a suitable cell (Suitable cell) for the mobile terminal is not found, the cycle for performing measurement for cell reselection is extended even if the state of the serving cell is good. . Therefore, by using the offset value, it is possible to reduce the power consumption of the mobile terminal when it has not been registered in the CSG cell existing around the current serving cell. This offset value notification method can use the period (timer) notification method of performing measurement for cell reselection even if the state of the serving cell in the fifteenth embodiment is good. At this time, even if the offset value and the state of the serving cell are good, the notification of the cycle (timer) for performing measurement for cell reselection may be simultaneous or separate.

  In the above, LTE using HeNB using CSG has been described, but the present invention is also referred to as UMTS using HNB using CSG, HeNB not using CSG, HNB, base station with a small radius (pico cell, macro cell Is also applicable.

  In the first modification of the fifteenth embodiment, in addition to the effects of the fifteenth embodiment, the following effects can be obtained. It is possible to reduce the power consumption of the mobile terminal when it has not been registered in the CSG cell existing around the current serving cell. Furthermore, the network side (base station etc.) has the above effect in that it does not know which CSG cell (which CSG-ID is included in the whitelist) to which CSG cell the mobile terminal is registered. The solution of the first modification of the fifteenth embodiment is excellent. As a result, it is not necessary to notify the CSG-ID in the whitelist from the mobile terminal to the base station, and radio resources can be effectively used. In addition, since the base station does not have to manage the CSG-ID in the whitelist of the mobile terminals being served thereby, the effect of reducing the processing load of the base station can be obtained.

  Next, a second modification of the fifteenth embodiment will be described. A solution different from the first modification of the fifteenth embodiment will be disclosed with respect to the problem shown in the first modification of the fifteenth embodiment. The second modification of the fifteenth embodiment is a case where the state of the serving cell is good (Sx> S_intrasearch, Sx> S_intersearch), which is applied when CSG-ID is included in the whitelist in order to solve the above problem. Also in the case where the cell can not be selected although the measurement for cell selection is performed in a cycle (may be a timer) at which measurement for cell reselection is performed, the state of the serving cell is good. Also disclosed is the de-application of the period to make measurements for cell reselection. A specific operation example will be described using FIG. In FIG. 44, the description of the parts with the same step numbers as in FIG. 42 will be omitted. The mobile terminal, in step ST4206, determines whether or not cell reselection has been performed on the basis of the result of the measurement performed in step ST4205. If cell reselection is performed, the process returns to step ST4101. If cell reselection has not been performed, the mobile terminal makes a transition to step ST4207.

  In the above, LTE using HeNB using CSG has been described, but the present invention is also referred to as UMTS using HNB using CSG, HeNB not using CSG, HNB, base station with a small radius (pico cell, macro cell Is also applicable.

  In the second modification of the fifteenth embodiment, in addition to the effects of the fifteenth embodiment, the following effects can be obtained. It is possible to reduce the power consumption of the mobile terminal when it has not been registered in the CSG cell existing around the current serving cell. Furthermore, the network side (base station etc.) has the above effect in that it does not know which CSG cell (which CSG-ID is included in the whitelist) to which CSG cell the mobile terminal is registered. The solution of the second modification of the fifteenth embodiment is excellent. As a result, it is not necessary to notify the CSG-ID in the whitelist from the mobile terminal to the base station, and radio resources can be effectively used. In addition, since the base station does not have to manage the CSG-ID in the whitelist of the mobile terminals being served thereby, the effect of reducing the processing load of the base station can be obtained.

Sixteenth Embodiment
The sixteenth embodiment discloses a solution different from that of the fifteenth embodiment with respect to the problem shown in the fifteenth embodiment. Also, in the current cell reselection procedure, even if the reception quality of the serving cell which is a non-CSG cell is good, the following operation can be considered to enable selection of the CSG cell of the neighboring cell. For example, set S_intrasearch low. As a result, even when the reception quality of the serving cell is good, the measurement standard is easily satisfied, and measurement for cell reselection is easily performed. However, when S_intrasearch is lowered as described above, all mobile terminals under the serving cell (including mobile terminals not having CSG-ID in the white list) have good reception status of the serving cell. The measurement criteria are more likely to be met and measurements for cell reselection are more likely to be made. In that case, since it is impossible for the mobile terminal (not registered in the CSG cell) to select a CSG cell, useless measurement will occur and a problem of increased power consumption of the mobile terminal will occur.

  In the sixteenth embodiment, in order to solve the above problems, metrics for initiating cell reselection are divided into cases where CSG-ID is included in the whitelist and cases where CSG-ID is not included in the whitelist. It discloses that it is provided and reflected to the mobile terminal. More specifically, there is a CSG-ID in the whitelist and a CSG-ID in the whitelist, which is a metric for initiating cell reselection, which is compared to the received quality of the serving cell. It discloses that it is provided separately and reflected on the mobile terminal. A specific operation example will be described using FIG. In FIG. 45, the description of the same step numbers as in FIGS. 41 and 42 will be omitted. The mobile terminal, in step ST4201, determines whether the white list includes the CSG-ID. Alternatively, the mobile terminal determines whether it is registered in the CSG cell. When CSG-ID is included in the whitelist or when registered in the CSG cell, the mobile terminal makes a transition to step ST4501. When CSG-ID is not included in the whitelist or when not registered in the CSG cell, the mobile terminal makes a transition to step ST4502. The mobile terminal, in step ST4501, determines whether the measurement criteria for cell reselection to be applied when CSG-ID is included in the white list are satisfied. As a specific example, it is determined whether or not the reception quality (for example, Sx) of the serving cell is equal to or less than a threshold (for example, S_intrasearchCSG) to be applied when CSG-ID is included in the white list.

  When the measurement standard is satisfied, as a specific example, when Sx ≦ S_intrasearch CSG, the process proceeds to step ST4205. When not satisfying the measurement standard, as a specific example, if Sx> S_intrasearchCSG, the process returns to step ST4501. In this case, it may be compared with a threshold (for example, S_intersearchCSG) for determining whether or not the inter-frequency metric is satisfied, as well as the threshold whether or not the inter-frequency metric is satisfied. The mobile terminal, in step ST4502, determines whether it meets the measurement criteria for cell reselection to be applied normally (which may be the case without CSG-ID in the white list). As a specific example, it is determined whether the reception quality (for example, Sx) of the serving cell is less than or equal to a threshold (S_intrasearch). If the measurement standard is satisfied, as a specific example, if Sx ≦ S_intrasearch, the process proceeds to step ST4208. If the measurement standard is not satisfied, as a specific example, if Sx> S_intrasearch, the process returns to step ST4502. In this case, it may be compared with a threshold (for example, S_intersearch) for determining whether or not the inter-frequency metric is satisfied, as well as the threshold whether or not the inter-frequency metric is satisfied. Also, if the serving terminal is a non-CSG cell even if the mobile terminal has a CSG-ID in the white list (for example, S_intersearch CSG) applied to the case where the white list disclosed above has the CSG-ID. You may apply only. As a result, if the serving cell generated in the above solution is already a CSG cell, measurement for useless cell selection (there is no need to change the serving cell from a non-CSG cell to a CSG cell, Even when the reception quality is good, it is possible to reduce the measurement for selecting a CSG cell). This can obtain the effect of reducing the power consumption of the mobile terminal.

  The notification method of the metric for starting cell reselection when CSG-ID is included in the white list performs measurement for cell reselection even if the state of the serving cell in the fifteenth embodiment is good. A notification method of a period (timer) can be used. At this time, notification of the metric for starting cell reselection when CSG-ID is included in the whitelist may be simultaneous with or separate from the metric for normally applied cell reselection. Absent.

  In the above, LTE using HeNB using CSG has been described, but the present invention is also referred to as UMTS using HNB using CSG, HeNB not using CSG, HNB, base station with a small radius (pico cell, macro cell Is also applicable.

  The effects of the sixteenth embodiment are shown below. Under the umbrella of the base station, there may be a mixture of mobile terminals having a CSG-ID in the whitelist and mobile terminals not having the CSG-ID in the whitelist. By providing a metric for initiating cell reselection, which is applied when CSG-ID is included in the whitelist, if the reception quality of the serving cell (non-CSG cell) is good, re-use the CSG cell. The problem that the user can not receive the benefit of the CSG cell charging plan, which is caused by not performing the measurement for selection, and that the load reduction of the non-CSG cell can not be achieved also in the mobile communication system It is possible to solve the problem. If the CSG-ID is included in the whitelist, measurement is performed for cell reselection even if the serving cell state is good, and the mobile terminal not registered in the CSG cell not having the CSG-ID in the whitelist is registered. As in the prior art, no measurement for cell reselection is performed if the state of the serving cell is good. This makes it possible to omit the measurement for selecting a CSG cell even when the serving cell state is wasted for a mobile terminal that can not reselect the CSG cell because it is not registered in the CSG cell. . This can obtain the effect of reducing the power consumption of the mobile terminal not registered in the CSG cell. This effect is an effect according to the present invention which can not be obtained by the technique disclosed in Non-Patent Document 8.

  The solution of the sixteenth embodiment is excellent in that the problem can be solved without using the neighboring cell list. The reason is that, as described above, CSG cells, HeNBs, and HNBs assume portable sizes and weights, and it is assumed that installation and removal of these CSG cells and the like are performed frequently and flexibly. Therefore, in the solution using the neighboring cell list, the neighboring cell list needs to be updated each time the CSG cell, HeNB, HNB, etc. is installed or removed, and it is expected that the neighboring cell list will be updated frequently. . Therefore, the solution using the neighboring cell list is a complicated and complicated mobile communication system. Furthermore, the solution of the sixteenth embodiment is excellent in that the network side (such as a base station) does not know whether the mobile terminal has the CSG-ID in the whitelist or not but has the above effect. There is. By this, it is not necessary to notify the presence or absence of CSG-ID in the whitelist from the mobile terminal to the base station, and radio resources can be effectively used. In addition, since the base station does not need to manage the presence or absence of the CSG-ID in the whitelist of the mobile terminals being served thereby, the effect of reducing the processing load of the base station can be obtained.

  Next, a first modification of the sixteenth embodiment described above will be described. Specifically, a solution to the problem shown in the first modification of the fifteenth embodiment will be disclosed. In the first modification of the sixteenth embodiment, cell selection is performed based on a metric (eg, S_intrasearchCSG) for starting cell reselection, which is applied when CSG-ID is included in the white list to solve the above problem. And disapply the application of a metric (eg, S_intrasearchCSG) to initiate cell reselection if the cell can not be selected despite the measurements being taken. A specific operation example will be described using FIG. The mobile terminal, in step ST4206, determines whether or not cell reselection has been performed on the basis of the result of the measurement performed in step ST4205. If cell reselection is performed, the process returns to step ST4101. When cell reselection is not performed, it transfers to step ST4502.

Embodiment 17
In 3GPP, base stations called Home-NodeB (Home-NB, HNB) and Home-eNodeB (Home-eNB, HeNB) are being studied. HNB / HeNB is a base station for home, corporate, and commercial access services in UTRAN / E-UTRAN, for example. Non-Patent Document 9 discloses three different modes of access to HeNB and HNB. It is an open access mode (Open access mode), a closed access mode (Closed access mode), and a hybrid access mode (Hybrid access mode). Each mode has the following features. In the open access mode, the HeNB or HNB is operated as a normal operator's normal cell. In the closed access mode, the HeNB or HNB is operated as a CSG cell. A CSG cell is a cell accessible only to CSG members. In the hybrid access mode, non-CSG members are also CSG cells to which access is simultaneously permitted. The cells in the hybrid access mode are, in other words, cells supporting both the open access mode and the closed access mode. A cell in hybrid access mode is also called a hybrid cell.

  In 3GPP, even if the reception quality of the serving cell is good, a method is considered for enabling cell reselection to a desired CSG cell. This is considered to require consideration also in the hybrid cell. For example, in non-patent document 10, in a hybrid cell, UEs of CSG members should stay longer than UEs of non-CSG members, so that a camping mechanism is performed between UEs of CSG members and UEs of non-CSG members. It has been proposed that they need to be different. However, Non-Patent Document 10 does not describe at all about the specific method.

  As the hybrid cell is a CSG cell, as a specific method for the UE of the CSG member to stay longer than the UE of the non-CSG member in the hybrid cell, the fifteenth embodiment, the first modification of the fifteenth embodiment, The method disclosed in the fifteenth modification, the sixteenth embodiment, or the first modification of the sixteenth embodiment can be applied. According to these methods, even if the state of the serving cell is good, UEs having a CGS-ID in the white list (CSG-ID list, allowed CSG list) or UEs registered in a CSG cell do not It is possible to execute the cell reselection procedure earlier. For this reason, it becomes possible to detect CSG cells including hybrid cells quickly. Therefore, the UE having the CSG-ID of the CSG to which the hybrid cell belongs or the UE registered in the CSG can perform cell reselection to the hybrid cell early. The method disclosed in the above embodiment can also be applied to the specific operation.

  In the sixteenth embodiment, it has been disclosed to separately provide the cell reselection metric in the whitelist with and without the CSG-ID. As an example, the threshold for cell reselection when there is no CSG-ID in the whitelist is S_intrasearch, and the threshold for cell reselection with the CSG-ID in the whitelist is S_intrasearchCSG.

  S_intrasearchCSG is lower than S_intrasearch so that the cell reselection procedure is performed earlier when CSG-ID is included in the whitelist than when CSG-ID is not included in the whitelist (S_intrasearch> S_intrasearchCSG) It is good to set up. The lower the cell reselection threshold is, the easier it is to start the cell reselection procedure, and as a result, the UE of the CSG member can make it easier to reselect to the CSG cell quickly. Accordingly, also in the seventeenth embodiment, it is possible to facilitate quick cell reselection to a hybrid cell as well.

Eighteenth Embodiment
As a specific method of enabling cell reselection to a desired CSG cell even when the reception quality of the serving cell is good, for example, Non-Patent Document 11 describes a method of giving Qoffset for each CSG cell.

  As shown in Non-Patent Document 7, Qoffset is an offset given to a reception quality measurement value of a detected cell when cell ranking is performed at cell reselection. The Qoffset is broadcast from the serving cell together with the information on the cell to which the Qoffset is given.

  For example, Non-Patent Document 12 describes a method of giving one Qoffset to a hybrid cell, in other words, a method of giving one Qoffset to all cells in the hybrid access mode. Furthermore, a method is shown in which two Qoffsets corresponding to the RSRP range of the macro cell are provided, and each Qoffset is applied to a certain threshold of RSRP of the macro cell above and below it.

  As in these methods, just giving Qoffset to each CSG cell or to one hybrid cell or corresponding to the RSRP range of the macro cell, position relationship with each cell or cell type or macro cell It is only possible to make the offset value different on a per-issue basis.

  However, although the hybrid cell is a CSG cell, it simultaneously supports both the open access mode and the closed access mode. For this reason, for hybrid cells, the criteria for cell reselection can not be made different between UEs of non-CSG members and UEs of CSG members. Therefore, in these methods, there arises a problem that the CSG member UE can not stay longer than the non-CSG member UE in the hybrid cell.

  In order to solve this problem, in this embodiment, an offset value (Qoffset_csg) applied to a UE having a CSG-ID in a whitelist or a UE registered in CSG, and an offset value applied to UEs other than that ( Set Qoffset_noncsg).

  Thus, the criteria for cell reselection can be set to UEs of non-CSG members by providing offsets separately for UEs having a CSG-ID or UEs registered to the CSG and not for whitelists in the whitelist. And CSG member UE can be differentiated. This enables UEs of CSG members to stay longer than UEs of non-CSG members even in hybrid cells.

  A specific operation example will be described using FIG. In FIG. 46, the description of the same step numbers as in FIG. 41 will be omitted. In ST4103, the UE performs measurement for cell reselection and performs cell ranking. In Step ST4601, the UE determines whether the whitelist includes the CSG-ID. Alternatively, the UE determines whether it has registered in the CSG cell. If the whitelist includes a CSG-ID or if it is registered in a CSG cell, the mobile terminal makes a transition to ST4602. In ST4602, the UE subtracts Qoffset_csg from the measured value. When the whitelist does not include the CSG-ID or when it is not registered in the CSG cell, the mobile terminal shifts to ST4603. In ST4603, the UE subtracts Qoffset_noncsg from the measured value. By performing cell ranking based on the result of these subtractions, judgment criteria for reselecting the cell between UEs having a CSG-ID in the whitelist or UEs registered in the CSG and UEs that are not so are indicated. It can be made different. It is also possible to make cell ranking only in step ST4602 or step ST4603, and omit cell ranking in step ST4103.

  With regard to the values of Qoffset_noncsg and Qoffset_csg, depending on the radio environment of the serving cell and neighboring cells, UEs having CSG-ID in the whitelist or UEs registered to CSG re-cell earlier than non-UE UEs. It may be set to meet the reception quality standard of selection.

  For example, the value of Qoffset_csg is set to be lower than the value of Qoffset_noncsg (Qoffset_noncsg> Qoffset_csg). By doing this, the result calculated in consideration of these offsets for one cell is higher for UEs that have CSG-ID in the whitelist or UEs that are registered for CSG than UEs that are not. Get higher. Therefore, UEs having a CSG-ID in the whitelist or UEs registered to the CSG will meet the cell reselection reception quality criteria earlier than UEs that do not. By meeting the reception quality standard of cell reselection earlier, it is possible to perform reselection to a suitable cell more quickly. Therefore, for hybrid cells, UEs of CSG members can be made to reselect cells earlier than UEs of non-CSG members, and UEs of CSG members can be made to stay longer than UEs of non-CSG members. Become.

  The following equation may be used as the criteria for cell ranking.

For UEs that have a CSG-ID in the whitelist or UEs that are registered to the CSG:
Rn = Qmeas, n-Qoffset_csg
And for UEs that are not,
Rn = Qmeas, n-Qoffset_noncs
I assume.

  Qmeas, n is the reception quality measurement value of the nth cell, and Rn is the calculation result of the reception quality in consideration of the offset.

  Alternatively, the following equation may be used as the cell ranking criteria.

For UEs that have a CSG-ID in the whitelist or UEs that are registered to the CSG:
Rn = Qmeas, n-Qoffset-Qoffset_csg
And UE that is not so
Rn = Qmeas, n-Qoffset-Qoffset_noncsg
I assume.

  In consideration of the conventional Qoffset, Qoffset_noncsg and Qoffset_csg can be used only to differentiate between UEs having a CSG-ID in the whitelist or UEs that are not registered with the CSG and UEs that do not.

  As the notification methods of Qoffset_csg and Qoffset_noncsg, the first to fourth methods disclosed as the notification method of the cycle for performing measurement for cell reselection in Embodiment 15 can be applied. When these are applied, similar effects can be obtained.

  Further, in the first method, when using SIB, notification may be made using SIB4. In SIB4, the conventional offset value is transmitted together with the information of the corresponding cell. By transmitting the offset value together with such information, it becomes possible to execute the cell ranking criteria together with the conventional offset value for each corresponding cell. A PCI range that can be provided for a hybrid cell may be used as the information of the corresponding cell. By doing this, the same value can be set for a plurality of hybrid cells, and the information amount of SIB 4 can be reduced.

  In the second method, only the hybrid cell may notify the offset value as broadcast information.

  In the method disclosed above, an offset value (Qoffset_csg) to be applied to UEs having a CSG-ID in the whitelist or UEs registered to the CSG and an offset value (Qoffset_noncsg) to be applied to UEs that are not are provided. Cell ranking is performed using and cell reselection is performed.

  As another method, a value (Qoffset_delta) of the difference between the offset value applied to UEs having CSG-ID in the whitelist or UEs registered to CSG may be provided. . That is, Qoffset_noncsg and Qoffset_delta may be provided and used for cell ranking criteria.

  For example, as the criteria for cell ranking, the following equation may be used.

For UEs that have a CSG-ID in the whitelist or UEs that are registered to the CSG:
= Qmeas, n-(Qoffset_noncsg-Qoffset_delta)
And for UEs that are not,
= Qmeas, n-Qoffset_noncsg
I assume.

  Thereby, an effect equivalent to the method of notifying Qoffset_noncsg and Qoffset_csg disclosed above can be obtained.

  As another method, an offset value to be applied to UEs not having CSG-ID in the white list or UEs not registered in CSG is set as the conventional Qoffset and used together with the difference value Qoffset_delta. Also good.

  For example, as the criteria for cell ranking, the following equation may be used.

For UEs that have a CSG-ID in the whitelist or UEs that are registered to the CSG:
Rn = Qmeas, n- (Qoffset-Qoffset_delta)
And UE that is not so
Rn = Qmeas, n-Qoffset
I assume.

  As a result, not only the same effect as the method disclosed above can be obtained, but one parameter to be set can be reduced. That is, it is not necessary to set both Qoffset_csg and Qoffset_noncsg, and it is sufficient to set Qoffset_delta. Therefore, the amount of information for parameter setting can be reduced. The above-described method can be applied as the notification method. As another method, Qoffset and Qoffset_delta may be notified from different cells. For example, Qoffset is notified from the serving cell, and Qoffset_delta is notified from the hybrid cell. Since Qoffset_delta is a value used only for hybrid cells, UEs that have CSG-ID in the white list or UEs registered in CSG in the white list can be notified only from the hybrid cells in the cell ranking criteria. The recalculation may be performed using the offset value (Qoffset_delta). Since UEs that do not do not need to recalculate and do not need to receive the offset value of the hybrid cell, it is only necessary to measure the reception quality. Therefore, it is possible to simplify the measurement at the time of cell reselection, and the effect of reducing the power consumption of the UE can be obtained.

  The method disclosed in the present embodiment is a method of giving Qoffset to each CSG cell shown in Non-Patent Document 11, a method of giving one Q offset to hybrid cells shown in Non-Patent Document 12, or It is also possible to apply two Qoffsets corresponding to the RSRP range, and apply each Qoffset above and below to a certain threshold of RSRP of the macro cell. For example, these Qoffsets may be used as the Qoffset in the criteria for cell ranking disclosed in the present embodiment, or in addition to the Qoffset. This also makes it possible to consider each Qoffset corresponding to, for example, a CSG cell-by-CSG cell, or a hybrid-specific or macro cell RSRP range.

  Also, as another method, the values shown in these non-patent documents are applied to UEs that have CSG-ID in the white list or UEs that are registered to CSG but not to UEs that do not. Do not. For example, as the criteria for cell ranking, values indicated in these non-patent documents may be used as Qoffset_delta. By doing this, it is possible to make the criteria for cell reselection different between the non-CSG member UE and the CSG member UE for the hybrid cell.

  The method disclosed in this embodiment is the fifteenth embodiment, the first modification of the fifteenth embodiment, the second modification of the fifteenth embodiment, the sixteenth embodiment, the first modification of the sixteenth embodiment, It is possible to use in combination with the method disclosed in the seventeenth embodiment.

  For example, FIG. 47 shows a specific operation example in the case of combining with the fifteenth embodiment. In FIG. 47, the description of the parts with the same step numbers as in FIG. 42 will be omitted. In step ST4201, the UE determines whether the whitelist includes the CSG-ID. Alternatively, the UE determines whether it has registered in the CSG cell. When CSG-ID is included in the whitelist or when registered in the CSG cell, Qoffset_csg is subtracted from the measured value in ST4701. If CSG-ID is not included in the whitelist or if it is not registered in the CSG cell, Qoffset_noncsg is subtracted from the measured value in ST4702. By performing cell ranking based on the result of these subtractions, judgment criteria for reselecting the cell between UEs having a CSG-ID in the whitelist or UEs registered in the CSG and UEs that are not so are indicated. It can be made different. It is also possible to make cell ranking only in step ST4701 or step ST4702, and omit cell ranking in step ST4205 or step ST4208.

  It becomes possible to combine and use it by setting it as the same operation also about other embodiments and a modification. By combining the method disclosed in the present embodiment with these embodiments and modifications, it is possible to flexibly cope with differences in radio wave environments associated with flexible placement of HeNBs or HNBs including hybrid cells. Is obtained.

  By adopting the method disclosed in the present embodiment, it is possible to make the criteria for cell reselection different between the non-CSG member UE and the CSG member UE with respect to the hybrid cell. This enables UEs of CSG members to stay longer than UEs of non-CSG members even in hybrid cells.

  This enables CSG members to receive faster and longer services such as high-speed communication and preferential charging plans for CSG members in hybrid cells.

Embodiment 19: FIG.
In the eighteenth embodiment, a method in which a CSG member UE performs cell reselection earlier for a hybrid cell than a non-CSG member UE, in other words, a method for facilitating (inbound, inbound) reselection to a hybrid cell Was disclosed.

  In this embodiment, the CSG member UE performs cell reselection later from the hybrid cell than the non-CSG member UE, that is, white (outbound) to make it difficult to perform cell reselection from the hybrid cell. An offset value (Qoffset_csg) to be applied to UEs having CSG-ID in the list or a UE registered in CSG and an offset value (Qoffset_noncsg) to be applied to UEs other than CSG are provided, and using them, cell ranking and cell reselection It discloses about the case where the criteria of cell reselection are made to differ by UE of a non-CSG member, and UE of a CSG member as selection is applied.

  As a specific operation example, the criteria for cell ranking may be set as the following equation.

For UEs that have a CSG-ID in the whitelist or UEs that are registered to the CSG:
Rs = Qmeas, s + Qhyst-Qoffset_csg
And for UEs that are not,
Rs = Qmeas, s + Qhyst-Qoffset_noncsg
I assume.

  Qmeas, s is the reception quality measurement value of the serving cell, Qhyst is the offset value for providing hysteresis, and Rs is the calculation result of the reception quality of the serving cell in consideration of the offset.

  In reselection from a hybrid cell, the hybrid cell becomes a serving cell. Therefore, in order to make it difficult to reselect cells from hybrid cells, UEs that have CSG-ID in the white list or UEs registered in CSG in the measured value of the serving cell at the time of cell ranking at cell reselection And the difference between UE and not so. As a specific example, calculation is made using Qoffset_noncsg and Qoffset_csg when Rs is derived. This makes it possible to make the determination criteria for performing cell reselection from hybrid cells different in both UEs.

  Regarding the value of Qoffset_noncsg and the value of Qoffset_csg, depending on the radio environment of the serving cell and neighboring cells, UEs having CSG-ID in the whitelist or UEs registered in CSG are slower than cell UEs that are not so. It may be set to meet the reception quality standard of selection.

  For example, the value of Qoffset_csg is set to be higher than the value of Qoffset_noncsg (Qoffset_noncsg <Qoffset_csg). By doing this, the results calculated by considering these offsets for the serving cell that is a hybrid cell are better for UEs that have CSG-ID in the whitelist or UEs that are not registered for CSG than UEs that are not. Also lower. Therefore, UEs having a CSG-ID in the whitelist or UEs registered to the CSG will meet the cell reselection reception quality criteria later than UEs that do not.

  By meeting the reception quality criteria of cell reselection later, it is possible to prevent reselection from the hybrid cell later. Therefore, in a hybrid cell, UEs of CSG members can be allowed to make cell reselection later than UEs of non-CSG members, and UEs of CSG members can be allowed to stay longer than UEs of non-CSG members.

  FIG. 48 shows a specific operation example of cell reselection in the hybrid cell. In FIG. 48, the description of the parts with the same step numbers as in FIG. 41 will be omitted. The UE that has entered the cell selection or cell reselection procedure in ST 4101 performs measurement of the serving cell for cell reselection, and performs cell ranking criteria for the serving cell. In Step ST4801, the UE determines whether the whitelist includes the CSG-ID. Alternatively, the UE determines whether it has registered in the CSG cell. When CSG-ID is included in the whitelist or when registered in the CSG cell, the process moves to ST4802. In ST 4802, the UE subtracts Qoffset_csg from the measured value. If the whitelist does not include the CSG-ID, or if it has not been registered in the CSG cell, it moves to ST4803. In ST 4803, the UE subtracts Qoffset_noncsg from the measured value. Based on these subtraction results, it is determined in ST 4102 whether the metric for cell reselection is satisfied. By doing this, it is possible to make the judgment criteria for performing cell reselection different between a UE having a CSG-ID in the whitelist or a UE registered in the CSG and a UE that is not so.

  The offset values (Qoffset_csg, Qoffset_noncsg) may not be used when deriving the measurement value of the serving cell in the case of performing cell ranking including the reception quality measurement value of the serving cell in ST4103. If not used, it is possible to increase the possibility that a CSG member UE selects a serving cell.

  Also, separately provide an offset value (Qoffset_csg_r) to be applied to UEs having a CSG-ID or a UE registered in CSG in a white list, and an offset value (Qoffset_noncsg_r) to be applied to UEs that are not so, and in ST4103 When deriving the measurement values of the serving cell in the case of performing cell ranking including the reception quality measurement value, they may be applied to the measurement value of the serving cell to perform cell ranking and perform cell reselection. In this case, Qoffset_noncsg_r may be set higher than Qoffset_csg_r. By doing this, the results calculated by considering these offsets for the serving cell that is a hybrid cell are better for UEs that have CSG-ID in the whitelist or UEs that are not registered for CSG than UEs that are not. Will also be high. Therefore, UEs having a CSG-ID in the white list or UEs registered to the CSG can be more likely to select a serving cell than UEs that are not.

  By setting the criteria for cell ranking as described above, in the hybrid cell, UEs of CSG members can be made to reselect cells later than UEs of non-CSG members, and UEs of CSG members are non-CSG members. It is possible to stay in the hybrid cell longer than the UE.

  As the notification method of these parameters, the first to fourth methods disclosed as the notification method of the cycle for performing measurement for cell reselection in the fifteenth embodiment can be applied, and similar effects can be obtained. .

  By combining the present embodiment and the eighteenth embodiment, UEs of CSG members make it easier to reselect to hybrid cells than UEs of non-CSG members, and it is difficult to reselect from hybrid cells. It is possible to Therefore, it becomes possible to make the UE of the CSG member stay in the hybrid cell longer than the UE of the non-CSG member.

  When the present embodiment and the eighteenth embodiment are combined, an offset value provided to make it easier for a CSG member UE to reselect to a hybrid cell than a non-CSG member UE, and a cell from a hybrid cell The offset values provided to make reselection difficult may be set to different values or may be the same value.

  For example, offset values provided to facilitate reselection to a hybrid cell are Qoffset_csg_in and Qoffset_noncsg_in, and offset values provided to make it difficult to reselect cells from a hybrid cell are Qoffset_csg_out and Qoffset_noncsg_out, respectively. To be able to set This makes it possible to cope with more flexible HeNB and HNB installation and operation.

  As an example of setting the same value, it is preferable to provide two offsets of Qoffset1 and Qoffset2. In order to facilitate reselection to a hybrid cell, Qoffset_csg = Qoffset1 and Qoffset_noncsg = Qoffset2 are set to be used in derivation of cell ranking Rn of neighboring cells. On the other hand, in order to make it difficult to reselect cells from the hybrid cell, Qoffset_csg = Qoffset2 and Qoffset_noncsg = Qoffset1 are set, and they are used in the derivation of the cell ranking Rs of the serving cell. It is preferable to set Qoffset1 lower than Qoffset2. By doing this, the number of parameters can be reduced, and the amount of information to be transmitted to the UE can be reduced.

  The notification methods disclosed in the fifteenth and eighteenth embodiments can be used as the notification method of these parameters, and a combination of various notification methods is also possible.

  For example, since Qoffset_csg_in and Qoffset_noncsg_in are used for deriving cell ranking Rn of neighboring cells, the serving cell notifies SIB4 using SIB4, and Qoffset_csg_out and Qoffset_noncsg_out are used for deriving cell ranking Rs of the serving cell in the hybrid cell, so SIB1 only from the hybrid cell It may be notified by.

  By doing this, it is possible to reduce the amount of information notified from cells that are not hybrid cells.

  In the case where two offsets of Qoffset1 and Qoffset2 are provided, notification may be made in SIB1 of all cells. By doing this, it is possible to reduce the amount of information to be notified also in the hybrid cell.

  The method disclosed in this embodiment is the fifteenth embodiment, the first modification of the fifteenth embodiment, the second modification of the fifteenth embodiment, the sixteenth embodiment, the first modification of the sixteenth embodiment, It is possible to use in combination with the method disclosed in the seventeenth embodiment and the eighteenth embodiment.

  By combining the method disclosed in the present embodiment with these embodiments and modifications, CSG members can be used even in various radio wave environments associated with flexible placement of HeNBs or HNBs including hybrid cells. UEs can make reselection to a hybrid cell easier than non-CSG member UEs, and make reselection from a hybrid cell difficult. Therefore, it becomes possible to make UE of a CSG member stay longer than UE of a non-CSG member in a hybrid cell.

Embodiment 20
In the above embodiment, the method of cell reselection to / from the hybrid cell is disclosed in order to make the CSG member UE stay longer than the non-CSG member UE in the hybrid cell. In this embodiment, a method of handover to / from a hybrid cell (inbound HO / outbound HO) for making a UE of a CSG member stay longer than a UE of a non-CSG member in a hybrid cell is disclosed.

  In handover to / from a hybrid cell, the procedures, rules and criteria of the handover are made different between the non-CSG member UE and the CSG member UE. As a specific method, for the parameters using HO to / from hybrid cell, parameters applicable to UEs having CSG-ID in the white list or UEs registered to CSG and parameters applied to UEs other than CSG-ID are provided. . The criteria of the handover to / from the hybrid cell are made different between the non-CSG member UE and the CSG member UE by setting the parameters to different values for the non-CSG member UE and the CSG member UE. Is possible.

  As an example of a parameter used for handover to / from a hybrid cell, there is a parameter serving as a determination index as to whether or not to generate an event in a measurement report. Event occurrence threshold (Thresh, Thresh1, Thresh2), offset value of serving cell applied to measurement result of reception quality (Ocs), offset value of serving cell frequency applied to measurement result of reception quality (Ofs), Adjacent cell offset value (Ocn) applied to the reception quality measurement result, adjacent cell frequency offset value (Ofn) applied to the reception quality measurement result, offset value per event (Off), event There is hysteresis (Hys) for each.

  For example, when the serving cell is a hybrid cell, Thresh_noncsg applied to UEs having CSG-ID in the white list or UEs registered in CSG in the white list and Thresh_csg applied to UEs not provided are provided as thresholds for event occurrence. By setting Thresh_csg higher than Thresh_noncsg, UEs of CSG members have a later event occurrence for handover slower than UEs of non-CSG members, and it is possible to allow hybrid cells to stay longer.

  For example, for offset values of adjacent cells, Ocn_csg applied to UEs having CSG-ID in the white list or UEs registered in CSG and Ocn_noncsg applied to UEs not provided are provided. When the offset value is subtracted from the measurement result of the reception quality, Ocn_noncsg is set higher than Ocn_csg. When the neighboring cell is a hybrid cell, the UE of the CSG member calculates the reception quality of the neighboring cell using Ocn_csg, and the UE of the non-CSG member calculates the reception quality of the neighboring cell using Ocn_noncsg. Since Ocn_noncsg is set higher than Ocn_csg, UEs of CSG members generate events for handover earlier than UEs of non-CSG members, and it is possible to handover to hybrid cells earlier.

  The notification method of the parameter may be notified individually to the UE to be measured from the serving cell. For example, it may be notified in the measurement control message. As a result, each UE can be set individually, and can be set according to the radio condition of each UE, so that the communication quality of each UE can be improved.

  In addition, the difference between the parameter applied to UEs having CSG-ID in the white list or UEs registered in CSG in advance and the parameter applied to UEs not broadcasted as measurements in the UE is broadcast as broadcast information from the serving cell. You may do it. What is notified to each UE may be set to only one of the parameters, and may be derived using the difference value. As a result, the amount of information notified to each UE is reduced, so that the resource load for signaling can be reduced.

  Alternatively, the difference value may be statically determined in advance, so that the base station and the UE can recognize the information in advance. Since it is not necessary to broadcast as broadcast information, it is possible to further reduce the impossibility of resources for signaling.

  By adopting the method disclosed in the present embodiment, it is possible for UEs of CSG members to HO faster than UEs of non-CSG members in handover to hybrid cells, and from handover to hybrid cells It is possible for the UE of the CSG member to perform handover later than the UE of the non-CSG member in the handover in step # 2. For this reason, it becomes possible to make UE of a CSG member stay in a hybrid cell longer than UE of a non-CSG member.

  Even when the serving cell does not recognize whether the UE is accessing as the open mode or the closed mode, it is possible to apply the method disclosed in this embodiment, even in such a case. It becomes possible to obtain the same effect.

  The method disclosed in this embodiment is the fifteenth embodiment, the first modification of the fifteenth embodiment, the second modification of the fifteenth embodiment, the sixteenth embodiment, the first modification of the sixteenth embodiment, It is possible to use in combination with the method disclosed in the seventeenth embodiment, the eighteenth embodiment and the nineteenth embodiment.

  By combining the method disclosed in this embodiment with these embodiments and modifications, CSG can be used regardless of the state of the UE, that is, whether the state of the UE is not only RRC_Idle but also in RRC_Conected state. It is possible to make a member UE stay in a hybrid cell longer than a non-CSG member UE.

Embodiment 21.
The problems of this embodiment are shown below. For example, cells of the same CSG-ID may be owned by the same owner, or cells of the same CSG-ID may receive the same charging preferential treatment, or cells of the same CSG-ID may be receiving the same preferential treatment at transmission speed, etc. Service can be considered. This may allow the user to want to reselect cells having the same CSG-ID.

  In order to solve this problem, in this embodiment, an offset value (Qoffset_samecsg) adapted to neighboring cells having the same CSG-ID as the serving cell and an offset value (Qoffset_diffcsg) adapted to neighboring cells having a CSG-ID different from the serving cell. Provide

  Thus, the cell reselection criteria have the same CSG-ID by separately offsetting the peripheral cell having the same CSG-ID as the serving cell and the peripheral cell having a CSG-ID different from the serving cell. It is possible to make the peripheral cell different from the peripheral cell having a different CSG-ID. This makes it possible to facilitate cell reselection of a cell having the same CSG-ID than a cell having a CSG-ID different from the serving cell.

  A specific operation example will be described using FIG. In FIG. 46, the description of the same step numbers as in FIG. 41 will be omitted. In ST4103, the UE performs measurement for cell reselection and performs cell ranking. In Step ST4601, the UE determines whether the measured CSG-ID of the neighboring cell is the same as the serving cell. If it is determined that the CSG-ID is the same, the process proceeds to ST4602. The UE subtracts Qoffset_samecsg from the measured value in ST4602. If it is determined that the CSG-ID is different, the process moves to ST4603. In ST4603, the UE subtracts Qoffset_diffcsg from the measured value. By performing cell ranking based on these subtraction results, it is possible to make the judgment criteria for performing cell reselection different between a neighboring cell having the same CSG-ID and a neighboring cell having a different CSG-ID. Become. It is also possible to make cell ranking only in step ST4602 or step ST4603, and omit cell ranking in step ST4103.

  Regarding the values of Qoffset_samecsg and Qoffset_diffcsg, cells with the same CSG-ID meet the reselection reception quality criteria more than cells with CSG-IDs different from the serving cell, depending on the radio environment of the serving cell and neighboring cells. It will be easier.

  For example, the value of Qoffset_samecsg is set to be lower than the value of Qoffset_diffcsg (Qoffset_diffcsg> Qoffset_samecsg). By so doing, cells having the same CSG-ID are more likely to meet the reselection reception quality criteria than cells having a CSG-ID different from the serving cell. By facilitating meeting the reselection reception quality criteria, it is possible to facilitate cell reselection of cells having the same CSG-ID.

  The following equation may be used as the criteria for cell ranking.

For neighboring cells having the same CSG-ID as the serving cell:
Rn = Qmeas, n-Qoffset_samecsg
For neighboring cells having a CSG-ID different from the serving cell,
Rn = Qmeas, n-Qoffset_diffcsg
I assume.

  Qmeas, n is the reception quality measurement value of the nth cell, and Rn is the calculation result of the reception quality in consideration of the offset.

  Also, the Qoffset_samecsg and Qoffset_diffcsg may be applied only to UEs having a CSG-ID in the whitelist or UEs registered in the CSG. UEs not registered in CSG do not want to reselect cells having the same CSG-ID. Therefore, the unnecessary processing load of the UE not registered in the CSG can be reduced by this, and the effect of reducing the power consumption of the UE can be obtained.

  Alternatively, the following equation may be used as the cell ranking criteria.

For neighboring cells having the same CSG-ID as the serving cell:
Rn = Qmeas, n-Qoffset-Qoffset_samecs g
And for neighboring cells having a CSG-ID different from the serving cell,
Rn = Qmeas, n-Qoffset-Qoffset_diffcsg
I assume.

  In consideration of the conventional Qoffset, Qoffset_samecsg and Qoffset_diffcsg can be used only to differentiate whether they have the same CSG-ID as the serving cell or a CSG-ID different from the serving cell.

  As the notification method of Qoffset_samecsg and Qoffset_diffcsg, the first to fourth methods disclosed as the notification method of the cycle for performing measurement for cell reselection in Embodiment 15 can be applied. When these are applied, similar effects can be obtained.

  Further, in the first method, when using SIB, notification may be made using SIB4. In SIB4, the conventional offset value is transmitted together with the information of the corresponding cell. By transmitting the offset value together with such information, it becomes possible to execute the cell ranking criteria together with the conventional offset value for each corresponding cell.

  In the method disclosed above, an offset value (Qoffset_samecsg) to be applied to neighboring cells having the same CSG-ID as the serving cell and an offset value (Qoffset_diffcsg) to be applied to neighboring cells having a CSG-ID different from the serving cell are provided. The cell ranking is performed using the cell reselection.

  As another method, a value (Qoffset_delta2) of a difference between an offset value applied to a neighboring cell having the same CSG-ID as the serving cell and an offset value applied to a neighboring cell having a CSG-ID different from the serving cell may be provided. . That is, Qoffset_diffcsg and Qoffset_delta2 may be provided and used for cell ranking criteria.

  For example, as the criteria for cell ranking, the following equation may be used.

For neighboring cells having the same CSG-ID as the serving cell:
Rn = Qmeas, n- (Qoffset_diffcsg-Qoffset_delta2)
And for neighboring cells having a CSG-ID different from the serving cell,
Rn = Qmeas, n-Qoffset_diffcsg
I assume.

  Thereby, the same effect as the method of notifying Qoffset_samecsg and Qoffset_diffcsg disclosed above can be obtained.

  As another method, an offset value to be applied to a neighboring cell having a CSG-ID different from the serving cell may be set as a conventional Qoffset and used together with the difference value Qoffset_delta2.

  For example, as the criteria for cell ranking, the following equation may be used.

For neighboring cells having the same CSG-ID as the serving cell:
Rn = Qmeas, n- (Qoffset-Qoffset_delta2)
And for neighboring cells having a CSG-ID different from the serving cell,
Rn = Qmeas, n-Qoffset
I assume.

  As a result, not only the same effect as the method disclosed above can be obtained, but one parameter to be set can be reduced. That is, it is not necessary to set both Qoffset_samecsg and Qoffset_diffcsg, and it is sufficient to set Qoffset_delta2. Therefore, the amount of information for parameter setting can be reduced. The above-described method can be applied as the notification method. Alternatively, Qoffset and Qoffset_delta2 may be notified from different cells. For example, Qoffset is notified from the serving cell, and Qoffset_delta2 is notified from the CSG cell. Since Qoffset_delta2 is a value used only for the CSG cell, it is notified only from the CSG cell, and in the cell ranking criteria, the offset value (Qoffset_delta2) for neighboring cells having the same CSG-ID as the serving cell. You can recalculate using. For non-CSG cells, there is no need to recalculate, it is only necessary to measure reception quality. Therefore, it is possible to simplify the measurement at the time of cell reselection, and the effect of reducing the power consumption of the UE can be obtained.

  The method disclosed in the present embodiment is a method of giving Qoffset to each CSG cell shown in Non-Patent Document 11, a method of giving one Q offset to hybrid cells shown in Non-Patent Document 12, or It is also possible to apply two Qoffsets corresponding to the RSRP range, and apply each Qoffset above and below to a certain threshold of RSRP of the macro cell. For example, these Qoffsets may be used as the Qoffset in the criteria for cell ranking disclosed in the present embodiment, or in addition to the Qoffset. This also makes it possible to consider each Qoffset corresponding to, for example, a CSG cell-by-CSG cell, or a hybrid-specific or macro cell RSRP range.

  The method disclosed in this embodiment is the fifteenth embodiment, the first modification of the fifteenth embodiment, the second modification of the fifteenth embodiment, the sixteenth embodiment, the first modification of the sixteenth embodiment, It is possible to use in combination with the method disclosed in the seventeenth embodiment, the eighteenth embodiment, the nineteenth embodiment, and the twentieth embodiment.

  For example, a specific operation example in the case of combining with the fifteenth embodiment will be described with reference to FIG. In FIG. 47, the description of the parts with the same step numbers as in FIG. 42 will be omitted. In step ST4201, the UE determines whether the whitelist includes the CSG-ID. Alternatively, the UE determines whether it has registered in the CSG cell. If the whitelist includes the CSG-ID or if it is registered in the CSG cell, ST 4701 is executed. In Step ST4701, when the measured CSG-ID of the neighboring cell is the same as the serving cell, the UE subtracts Qoffset_samecsg from the measured value. On the other hand, when the UE determines in step ST4701 that the CSG-ID is different from the serving cell, the UE subtracts Qoffset_diffcsg from the measured value. Cell ranking is performed based on the result of subtraction. If the whitelist does not include the CSG-ID or is not registered in the CSG cell, nothing is particularly executed in step ST4702. As a result, it is possible to make the judgment criteria for performing cell reselection different between the neighboring cell having the same CSG-ID and the neighboring cell having a different CSG-ID.

  It becomes possible to combine and use it by setting it as the same operation also about other embodiments and a modification. By combining the method disclosed in the present embodiment with these embodiments and modifications, it is possible to obtain an effect that it is possible to flexibly cope with differences in radio wave environments associated with the flexible arrangement of HeNBs or HNBs.

  By using the method disclosed in the present embodiment, it is possible to make the judgment criteria for performing cell reselection different between a neighboring cell having the same CSG-ID and a neighboring cell having a different CSG-ID. This makes it possible to facilitate cell reselection of a cell having the same CSG-ID than a cell having a CSG-ID different from the serving cell.

  This enables the user to continuously select cells of the same CSG-ID, and to receive the same service of the same CSG-ID. Therefore, it is possible to obtain the effect of constructing a mobile communication system that is easy for the user to use.

Embodiment 22.
UEs of CSG members stay longer than non-CSG member UEs in hybrid cells, as CSG members can receive services faster and longer, such as high-speed communication and preferential charging plans to CSG members in hybrid cells. Are required to

  FIG. 49 shows a conceptual diagram in the case where UEs of CSG members are allowed to stay longer than UEs of non-CSG members in the hybrid cell. In the figure, 4901 is a non-CSG cell, which is here a macro cell (eNB). 4902 shows the coverage by the non-CSG cell 4901. 4903 is HeNB of a hybrid access mode, ie, a hybrid cell. Reference numeral 4904 denotes coverage accessible in the hybrid cell 4903 in both the open access mode and the closed access mode. 4905 shows coverage accessible only in the closed access mode in hybrid cell 4903. 4906 is UE of the same CSG member as CSG to which the hybrid cell 4903 belongs. 4907 is UE of a non-CSG member. The CSG member UE 4906 communicates with the non-CSG cell 4901 outside the coverage 4905 area, and the UE 4906 moved to the coverage 4905 area communicates with the hybrid cell 4903 by cell reselection. The non-CSG member UE 4907 is still communicating with the non-CSG cell 4901 in the coverage 4905 area, and can move to the coverage 4904 and communicate with the hybrid cell 4903 by cell reselection.

  In this way, coverage of only the closed access mode is wider than coverage of the open access mode by keeping the UE of the CSG member longer than the UE of the non-CSG member when selecting from a hybrid cell or from a hybrid cell. It may become In such a case, assuming that the initial transmission power of the UE at the start of uplink communication in the hybrid cell is the same between the CSG member UE and the non-CSG member UE, the coverage where the CSG member UE can access is better. Because of the widening, there is a high possibility that uplink transmission of a CSG member UE may fail at the coverage end.

  There is an RA (random access) procedure as a procedure for starting uplink communication. In the RA procedure, PRACH is used as a physical channel. A RACH preamble is used for initial transmission of PRACH. The initial transmission power Pprach of the PRACH is determined as follows (Non-Patent Document 13, Non-Patent Document 14).

Pprach = min {Pcmax, PREAMBLE_RECEIVED_TARGET_POWER + PL} _ [dBm]
Pcmax = min {Pemax, Pumax}
Here, PREAMBLE_RECEIVED_TARGET_POWER is the target reception power of the base station, PL is the path loss, Pemax is the maximum allowable power set for each cell, and Pumax is the maximum transmission power of the UE. Pemax is notified to the affiliated UEs as broadcast information and the like from each cell, and is the maximum allowable power common to all the affiliated UEs. Pumax is determined in advance according to the power class of each UE.

  As understood from the derivation formula of the initial transmission power Pprach of the PRACH, for example, when PL is large, the initial transmission power is limited by Pcmax. Since Pcmax is also limited by Pemax, the initial transmission power of PRACH will be limited by Pemax. Since Pemax is common to all UEs under the control of a cell, in a hybrid cell, the same value is given to UEs of CSG members and UEs of non-CSG members. Therefore, when the PRACH initial transmission power is limited by Pemax, for example, when PL is large, UEs of CSG members and UEs of non-CSG members can transmit only up to common Pemax. For this reason, in the hybrid cell, when the accessible coverage of the CSG member UE becomes wider than the non-CSG member UE, the uplink transmission of the CSG member UE is likely to fail. It will

  This problem occurs in both the RRC_Idle state and the RRC_Connected state. For example, in the RRC_Idle state, when the UE of the CSG member reselects the cell to the hybrid cell, etc., in the RRC_Connected state, the UE of the CSG member makes HO to the hybrid cell. There is no prior art on this issue, and no discussion has been made in 3GPP.

  In the present embodiment, in order to solve this problem, a method is disclosed that makes it possible to differentiate the initial transmission power of the UE when starting uplink communication between the UE of a CSG member and the UE of a non-CSG member. As a specific example, in order to make the initial transmission power of PRACH different between UEs of CSG members and UEs of non-CSG members, the maximum allowable power used in derivation of PRACH initial transmission power in a hybrid cell is CSG Separately provide for the member UE and for the non-CSG member UE. Let Pemax_csg be the maximum allowable power for CSG members, and Pemax_noncsg be the maximum allowable power for non-CSG members.

  The derivation formula of the initial transmission power Pprach in the hybrid cell is as follows.

Pprach = min {Pcmax, PREAMBLE_RECEIVED_TARGET_POWER + PL} _ [dBm]
For CSG members, let Pcmax = min {Pemax_csg, Pumax},
For non-CSG members, Pcmax = min {Pemax_noncsg, Pumax}.

  In this way, the initial transmission power Pprach in the hybrid cell can have different maximum allowable powers between the UEs of CSG members and the UEs of non-CSG members, even if PL is large. When the coverage of UEs of CSG members is wider than UEs of non-CSG members in hybrid cells, uplink transmission failure of UEs of CSG members is reduced by keeping Pemax_csg larger than Pemax_noncsg. It is possible to

  Also, by providing for CSG member UEs and non-CSG member UEs for the maximum allowable power for each cell, it is possible to set different initial transmission powers for both UEs for each cell, making the system flexible. It is possible to deploy various hybrid cells and cope with the future increase in the number of HeNBs operated.

  The method of deriving uplink initial transmission power in the hybrid cell disclosed herein can be applied when starting uplink communication in the hybrid cell when, for example, a UE of a CSG member reselects to the hybrid cell in the state of RRC_Idle. Moreover, in the state of RRC_Connected, when UE of a CSG member performs HO to a hybrid cell etc., it is applicable when starting uplink communication in the said hybrid cell used as a target cell.

  A method of notifying the UE of the maximum allowable power used in the hybrid cell is disclosed below.

  As a first method, the cells to which the maximum allowable power is set are notified to the affiliated UEs by using the BCCH as broadcast information via the PBCH or PDSCH. Notification is made on PBCH using master information (MIB) or on PDSCH using system information (SIB). Since the MIB is mapped to the PBCH, the method using the MIB is excellent in that the mobile terminal can receive less control delay. When using SIB, it notifies using SIB1. The MIB or SIB1 is excellent in that it reduces the control delay of the mobile terminal in that it is the minimum amount of broadcast information received during the transition from the cell search start to the standby state (RRC-Idle state). It is a method. Furthermore, even in the case of a method of notifying by system information other than SIB1, since notification is performed using a channel for transmitting broadcast information, notification can be made to all mobile terminals under the umbrella, and effective use of radio resources is said. It is an excellent method in point.

  As a second method, when HOs the cells for which these maximum allowable powers are set as a target cell, the serving cell individually notifies the UEs performing HO. The UE may be notified by including it in target cell information required to perform HO, or may be notified using another message. By notifying in the information of the target cell, it is possible to reduce the number of required messages, so it is possible to reduce the time until HO is completed. On the other hand, when notification is performed using another message, the message can be notified only in the case of a cell requiring the setting of the maximum allowable power. Therefore, the HO for the cell in which the setting of the maximum allowable power is not necessary In this case, the amount of information required for notification can be reduced, and the number of messages can be reduced.

  The hybrid cell may determine the maximum allowable power (Pemax_csg) value for CSG members and the maximum allowable power (Pemax_noncsg) value for non-CSG members, or may be performed by the network side (MME, HeNBGW, etc.) . In the case of the network side, the network side notifies the hybrid cell in advance of the maximum allowable power. This notification can be performed using the hybrid cell and the interface S1 on the network side. By determining on the network side, it becomes possible to set values based on the radio wave environment and load conditions (for example, the number of connected terminals etc.) of the neighboring cells. As a system, it becomes possible to reduce an uncommunicable situation, a connection delay due to a communication error, an increase in the amount of signaling, concentration of load, and the like.

  In the method described above, the maximum allowable power for CSG members is Pemax_csg, and the maximum allowable power for non-CSG members is Pemax_noncsg. As another method, a common maximum allowable power (Pemax_common) may be provided to the CSG member and the non-CSG member, and a difference (Pemax_delta) of the maximum allowable power between the CSG member and the non-CSG member may be provided. An example of the derivation formula of the initial transmission power Pprach in the hybrid cell in this case is shown below.

Pprach = min {Pcmax, PREAMBLE_RECEIVED_TARGET_POWER + PL} _ [dBm]
For CSG members, Pcmax = min {Pemax_common + Pemax_delta, Pumax}, and for non-CSG members, Pcmax = min {Pemax_common, Pumax}. By this means, it is possible to have different maximum allowable powers for CSG member UEs and non-CSG member UEs, so that the same effect as the method described above is obtained.

  The Pemax set as the conventional maximum allowable power may be set as the common parameter Pemax_common. As a result, the method of deriving the initial transmission power of non-CSG members does not have to be changed from the current method. Thus, the effect of avoiding the complexity of the mobile communication system can be obtained.

  As another method, Pumax may be separately provided for CSG members and non-CSG members. Pumax is the maximum transmission power of the UE, and is determined in advance according to the power class of each UE. What is necessary is to decide in advance for CSG member (Pumax_csg) and for non-CSG member (Pumax_noncsg) according to the power class of each UE. An example of the derivation formula of the initial transmission power Pprach in the hybrid cell in this case is shown below.

Pprach = min {Pcmax, PREAMBLE_RECEIVED_TARGET_POWER + PL} _ [dBm]
For CSG members, let Pcmax = min {Pemax, Pumax_csg},
For non-CSG members, Pcmax = min {Pemax, Pumax_noncsg}. By doing this, the Pemax can be set to be common to all UEs under the control of the cell, and thus the setting may be the same as the conventional setting.

  It may be a static value as a mobile communication system. The static value refers to a value known to a mobile terminal or a base station as a mobile communication system, or a known value described in a standard document or the like. By using static values, no radio signal is generated between the base station (network side) and the mobile terminal. Therefore, an effect can be obtained in terms of effective utilization of radio resources. Furthermore, since the value is determined statically, it is possible to obtain an effect of preventing the occurrence of a reception error of a wireless signal.

  In the hybrid cell, a specific operation example in the case of setting the maximum allowable power for CSG members as Pemax_csg and the maximum allowable power for non-CSG members as Pemax_noncsg will be shown.

  FIG. 50 shows a procedure example up to PRACH initial transmission in the hybrid cell.

  First, UEs of CSG members will be described. A UE of a CSG member camps on a hybrid cell, for example, after cell reselection in ST5001. The hybrid cell transmits broadcast information in ST5004, and the UE of the CSG member receives the broadcast information. The broadcast information includes the maximum allowable power. When uplink transmission occurs in the UE of the CSG member in ST5005, the UE proceeds to ST5007 and derives uplink initial transmission power using the maximum allowable power (Pemax_csg) for the CSG member UE among the received maximum allowable powers. The UE of the CSG member sets the uplink initial transmission power as the transmission power in ST5009, and starts uplink transmission in ST5011.

  Next, UEs of non-CSG members will be described. A non-CSG member UE camps on a hybrid cell after cell reselection, for example, in ST50021. The hybrid cell transmits broadcast information in ST5004, and the UE of the non-CSG member receives the broadcast information. The broadcast information includes the maximum allowable power. When uplink transmission occurs in the UE of the non-CSG member in ST5006, the UE proceeds to ST5008, and uses the maximum allowable power (Pemax_noncsg) for the non-CSG member UE among the received maximum allowable powers, and performs initial uplink transmission power Derive The UE of the non-CSG member sets the uplink initial transmission power as the transmission power in ST5010, and starts uplink transmission in ST5012.

  In addition, since the timing of uplink transmission generation | occurrence | production differs for every UE, the timing of uplink initial transmission also differs for every UE. Therefore, for example, as shown in the figure, ST 5012 may be executed following ST 5011, or conversely, ST 5011 may be executed following ST 5012.

  In this way, even if UEs of CSG members can access, the maximum allowable power used for deriving the initial uplink transmission power differs depending on whether the UE camped on a hybrid cell is a CSG member or a non-CSG member. Even when camped in a certain area, only the UEs of CSG members can increase the transmission power of uplink transmission, so that uplink reception power sufficient for communication can be secured in the hybrid cell.

  By using the method disclosed in the present embodiment, uplink transmission of a CSG member UE fails in the case where the coverage of the CSG member UE becomes wider than the non-CSG member UE in the hybrid cell. It is possible to solve the problem that would be

  In addition, CSG member UEs can be allowed to stay longer than non-CSG member UEs in hybrid cells, and CSG members can provide faster and longer services such as high-speed communication and preferential charging plans to CSG members in hybrid cells. Make it possible to receive.

  In addition, since it is possible to provide a UE with non-CSG members with a lower maximum allowable power than UEs with CSG members, UEs with non-CSG members have a transmission power larger than necessary when PL is large. Can be prevented and uplink interference power can be reduced.

Embodiment 23
In this embodiment, in order to make the initial transmission power of the UE at the time of starting uplink communication different between UEs of CSG members and UEs of non-CSG members, CSG- in the white list in cell reselection The difference between the criteria applied to UEs having an ID or UEs registered to the CSG and UEs other than the UEs is used.

  As a specific example, the threshold (S_intrasearch) of cell reselection in the case where the whitelist does not have the CSG-ID disclosed in the seventeenth embodiment and the CSG-ID in the whitelist or registration in the CSG Use the difference with the cell reselection threshold (S_intrasearchCSG) in the case of

  Also, as another specific example, the present embodiment is applied to the offset value (Qoffset_csg_in) applied to UEs having a CSG-ID in the white list or UEs registered in CSG disclosed in the eighteenth embodiment and UEs that are not. Use the difference of the offset value (Qoffset_noncsg_in). The difference may be a difference value (Qoffset_delta).

  Also, as another specific example, the present embodiment is applied to the offset value (Qoffset_csg_out) applied to UEs having CSG-ID in the white list or UEs registered in CSG disclosed in the embodiment 19 and UEs that are not. Use the difference of the offset value (Qoffset_noncsg_out). The difference may be a difference value.

  These difference values may be used as difference values between the UE for the CSG member of the maximum allowable power and the UE for the non-CSG member used in deriving the PRACH initial transmission power in the hybrid cell.

  The threshold for cell reselection when there is no CSG-ID in the whitelist (S_intrasearch) and the threshold for cell reselection when there is a CSG-ID in the whitelist (S_intrasearchCSG) disclosed in the seventeenth embodiment. In the case of, this difference is used. Let the difference value be S_intrasearch_delta.

S_intrasearch_delta = S_intrasearch-S_intrasearchCSG
This value is set to Pemax_delta (= Pemax_csg−Pemax_noncsg) which is a difference value between the UE for the CSG member of the maximum allowable power and the UE for the non-CSG member used in derivation of the PRACH initial transmission power.

Pemax_delta = S_intrasearch_delta
Or
Pemax_delta = | S_intrasearch_delta |
As well.

In the case of the offset value (Qoffset_csg_in) applied to the UE having CSG-ID in the whitelist or the UE registered in CSG disclosed in the embodiment 18, and the offset value (Qoffset_noncsg_in) applied to the other UEs, , And the difference value as Qoffset_delta (= Qoffset_noncsg_in-Qoffset_csg_in),
Pemax_delta = Qoffset_delta
Or
Pemax_delta = | Qoffset_delta |
You should do.

In the case of the offset value (Qoffset_csg_out) applied to the UE having CSG-ID in the whitelist or the UE registered in CSG disclosed in the embodiment 19, and the offset value (Qoffset_noncsg_out) applied to the other UEs, , And the difference value as Qoffset_delta (= Qoffset_csg_out-Qoffset_noncsg_out),
Pemax_delta = Qoffset_delta
Or
Pemax_delta = | Qoffset_delta |
You should do.

  Specific operation of the method of using the difference between the criteria applied to UEs having CSG-ID in the whitelist or UEs registered in CSG in the whitelist and UEs not for deriving maximum allowable power in the hybrid cell An example is shown.

  FIG. 51 illustrates a procedure outline up to PRACH initial transmission in a hybrid cell in the case of using a difference between cell reselection thresholds.

  First, UEs of CSG members will be described. The UE of the CSG member camps on cell A after cell reselection, for example, in ST5101. The cell A transmits broadcast information in ST5104, and the UE of the CSG member receives the broadcast information. The broadcast information includes a cell reselection threshold. The UE of the CSG member performs cell reselection procedure using the cell reselection threshold (S_intrasearchCSG) in the case where it has CSG-ID in the white list or is registered in CSG among the received cell reselection threshold in ST5105. . In ST5107, it is judged whether the cell reselection criteria are met or not. If it matches, the process goes to ST5109. If it does not match, the process returns to ST5105. If a CSG member UE matches the cell reselection criteria in ST5107 and reselects to a hybrid cell, it camps on the hybrid cell in ST5109.

  The hybrid cell transmits broadcast information in ST 5112, and the CSG member UE receives the broadcast information. The broadcast information includes the maximum allowable power. However, the maximum allowable transmission power broadcasted here does not include the maximum allowable transmission power set differently for CSG members and non-CSG members as disclosed in Embodiment 22, and is common to conventional cells. Only the maximum allowable power. When uplink transmission occurs in the UE of the CSG member in ST5113, the UE proceeds to ST5115, and receives the threshold for cell reselection (S_intrasearch) in the case where the whitelist does not have CSG-ID received in ST5104, and the whitelist The difference value (S_intrasearch_delta) of the cell reselection threshold (S_intrasearch CSG) in the case of having CSG-ID in is derived. The UE of the CSG member ascends the difference value (S_intrasearch_delta) in ST5117 using the difference value (Pemax_delta) as the difference (Pemax_delta) of the transmission power between the CSG member UE and the non-CSG member UE in ST5116. The initial transmit power (Pprach) is derived. The UE of the CSG member sets the uplink initial transmission power as the transmission power in ST5119, and starts uplink transmission in ST5121.

  Next, UEs of non-CSG members will be described. Here, UEs of non-CSG members camp on cell A after cell reselection, for example, in ST5102. The cell A transmits broadcast information in ST5104, and the UE of the non-CSG member receives the broadcast information. The broadcast information includes a cell reselection threshold. In ST5106, the UE of the non-CSG member performs a cell reselection procedure using the received cell reselection threshold (S_intrasearch) when there is no CSG-ID in the whitelist. In ST5108, it is judged whether the cell reselection criteria are met or not. If it matches, the process goes to ST5110, and if it does not match, the process returns to ST5106. If a non-CSG member UE meets the cell reselection criteria in ST5108 and reselects to a hybrid cell, it camps on the hybrid cell in ST5110.

  Even in the case of a UE that has a CSG-ID in the whitelist but is a non-CSG member of the hybrid cell, the CSG in the whitelist will eventually be selected because reselection of the hybrid cell must be performed in the open access mode. Perform a cell reselection procedure using the cell reselection threshold (S_intrasearch) without ID and determine if it meets the criteria for cell reselection. In the case of a UE that has a CSG-ID in the whitelist but is a non-CSG member of a hybrid cell, for example, even if the cell reselection procedure is initially performed using S_intrasearchCSG, the UE can not determine the CSG-ID of the cell. The CSG-ID may be received and checked, and if the CSG-IDs do not match, cell reselection may be performed using the cell reselection procedure ST5106 for non-CSG members.

  The hybrid cell transmits broadcast information in ST 5112, and the UE of the non-CSG member receives the broadcast information. The broadcast information includes the maximum allowable power. However, the maximum allowable transmission power broadcasted here does not include the maximum allowable transmission power set differently for CSG members and non-CSG members as disclosed in Embodiment 22, and is common to conventional cells. Only the maximum allowable power. When uplink transmission occurs in the UE of the CSG member in ST5114, the process proceeds to ST5118, and uplink initial transmission power in ST5118 using the maximum allowable power (Pemax_common) common to the conventional cells reported from the hybrid cell in ST5112 Deduce (Pprach). The UE of the non-CSG member sets the uplink initial transmission power as the transmission power in ST5120, and starts uplink transmission in ST5122.

  In addition, since the timing of uplink transmission generation | occurrence | production differs for every UE, the timing of uplink initial transmission also differs for every UE. Therefore, for example, ST5122 may be executed following ST5121 as shown, or conversely ST5121 may be executed following ST5122.

  Thus, the UE camped on the hybrid cell using the difference between the criteria applied to UEs having CSG-ID in the whitelist or UEs registered to CSG and non-UE UEs in cell reselection. It is possible to adopt a method of making the maximum allowable power used for deriving the initial uplink transmission power different depending on whether the CSG member is a CSG member or a non-CSG member. At this time, even if the CSG member UE is camped on in an accessible area, only the CSG member UE can increase the transmission power of uplink transmission, so it is sufficient for communication in the hybrid cell. It is possible to secure uplink received power.

  The method disclosed in the seventeenth embodiment, the eighteenth embodiment, the nineteenth embodiment, and the twentieth embodiment can be used without being limited to the above specific example.

  Of the criteria in cell reselection, the configuration parameters affecting the coverage of the hybrid cell are not limited to this example, and based on the difference, the initial PRACH for CSG member UEs and non-CSG member UEs It suffices to derive the transmission power.

  When a plurality of criteria for cell reselection are set (for example, a threshold and offset for cell reselection), which criteria should be used is determined in advance. For example, which one of a plurality of criteria may be prioritized. In this way, other criteria can be used in the order of priority even if one of the criteria is not set. As another example, among the plurality of criteria, which criteria to use may be determined according to their difference values. For example, a criterion with the largest difference value is used. As still another example, an average value of difference values of a plurality of references may be used.

  Also, as another method, the serving cell may determine which of the plurality of criteria to use and notify the UE. The notification method may be notification as notification information. Instead of determining the serving cell, the network side (MME, HeNBGW, etc.) may determine and notify the UE via the serving cell. The interface S1 can be used for notification from the network side to the serving cell. This makes it possible to flexibly cope with the arrangement of cells including hybrid cells. When the network side determines, it is possible to set the value based on the radio wave environment and load conditions (for example, the number of connected terminals etc.) of neighboring cells. As a system, it becomes possible to reduce an uncommunicable situation, a connection delay due to a communication error, an increase in the amount of signaling, concentration of load, and the like.

  The method described above uses the criteria in cell reselection. Therefore, it can be used when the hybrid cell is reselected using this criterion. In other cases, for example, when moving to a hybrid cell by HO, the method disclosed in the embodiment 22 is applied, and the setting value is notified separately from the serving cell to the UEs performing HO. Just do it.

  By using the method disclosed in the present embodiment, in the hybrid cell, it is possible to make the initial transmission power of the UE at the time of starting uplink communication different between the UE of the CSG member and the UE of the non-CSG member. It is possible for CSG member UEs to stay longer than non-CSG member UEs.

  In addition, it is used at the time of derivation of PRACH initial transmission power in the hybrid cell, in order to make it possible to make the initial transmission power of the UE different from the CSG member UE and the non-CSG member UE when starting uplink communication. The maximum allowable power is provided separately for the CSG member UE and for the non-CSG member UE, and they are broadcast from the hybrid cell to the UE under the umbrella, but in the hybrid cell, the derivation of PRACH initial transmission power is performed There is no need to separately provide the maximum allowable powers used for CSG member UEs and non-CSG member UEs, and therefore there is no need to broadcast them to the UE under the control. Therefore, it is possible to reduce the number of parameters that need to be broadcasted in the hybrid cell and further reduce the amount of information to be signaled.

  The methods disclosed in the seventeenth embodiment through the twenty-third embodiment are not limited to the case where an open mode cell (non-CSG cell) and a CSG cell are mixed (mixed carrier) on the same frequency carrier (the same frequency layer). The present invention is also applicable to the case where there is only a CSG cell on the same frequency carrier (the same frequency layer) (dedicated carrier). Also, if there is a hybrid cell in the same frequency layer, it can be applied.

  In addition to intra-frequency cell reselection and HO, it is also applicable to inter-frequency or inter-RAT (inter-RAT).

  In the above, LTE using HeNB using CSG has been described, but the present invention is also referred to as UMTS using HNB using CSG, HeNB not using CSG, HNB, base station with a small radius (pico cell, macro cell Is also applicable. In the first modification of the sixteenth embodiment, the following effects can be obtained in addition to the effects of the sixteenth embodiment. It is possible to reduce the power consumption of the mobile terminal when it has not been registered in the CSG cell existing around the current serving cell. Furthermore, the network side (base station etc.) has the above effect in that it does not know which CSG cell (which CSG-ID is included in the whitelist) to which CSG cell the mobile terminal is registered. The solution of the first modification of the sixteenth embodiment is excellent. As a result, it is not necessary to notify the CSG-ID in the whitelist from the mobile terminal to the base station, and radio resources can be effectively used. In addition, since the base station does not have to manage the CSG-ID in the whitelist of the mobile terminals being served thereby, the effect of reducing the processing load of the base station can be obtained.

  Although the CSG cell or the CSG-ID, which is information broadcasted by the cell, and the tracking area code (TAC) broadcasted by the CSG cell or cell are mainly described above, the present invention It is of course applicable even if the CSG-ID and the TAC are not associated.

  If not associated, for example, it may be determined separately whether or not it is registered in the CSG as follows and whether or not TA updating is necessary.

  In cell reselection, when it is determined whether or not the own mobile terminal is registered in the selected cell, whether or not the CSG-ID received according to the broadcast information of the cell is present in the white list of the own mobile terminal To judge. When the CSG-ID received according to the broadcast information of the cell is present in the whitelist, it is determined that the mobile terminal has already been registered in the selected cell. That is, it is determined that the cell can be an "appropriate cell" for the mobile terminal. On the other hand, when the CSG-ID received according to the broadcast information of the cell does not exist in the white list of the own mobile terminal, it is determined that the cell selected by the own mobile terminal is not registered. That is, it is determined that the cell can not be an "appropriate cell" for the mobile terminal.

  In addition, when it is determined whether or not TA update is necessary in cell reselection, one or more TACs stored in the own mobile terminal (hereinafter referred to as TA list) are received from the broadcast information of the cell. It is judged whether it is included in When the TAC received according to the broadcast information of the cell is included in the TA list in the mobile terminal, it is determined that the TA update is unnecessary and the TAU is unnecessary. On the other hand, when the TAC received according to the broadcast information of the cell is not included in the TA list in the own mobile terminal, it is determined that the TA needs to be updated and the TAU needs to be performed.

  As a specific example, it corresponds to step ST1406 to step ST1409 of FIG. 14, step ST1607 to step ST1610 of FIG.

  Although the present invention has been described focusing on an LTE system (E-UTRAN), the present invention is applicable to W-CDMA systems (UTRAN, UMTS) and LTE-Advanced. Furthermore, the present invention is applicable to a mobile communication system in which a closed subscriber group (CSG) is introduced, and a communication system in which an operator identifies a subscriber and the identified subscriber is permitted access similarly to the CSG. It is.

  101 mobile terminal, 102 base station, 103 MME (Mobility Management Entity), 104 S-GW (Serving Gateway).

Claims (4)

From a CSG base station which is a base station provided in a CSG cell belonging to a CSG of a closed subscriber group to a base station provided in another cell or from a base station provided in another cell to a CSG base station Is a mobile communication system to be handed over,
A mobile communication system characterized in that a handover procedure is different depending on whether a mobile terminal to be handed over is a CSG terminal belonging to a CSG or a non-CSG terminal not belonging to a CSG.   The mobile communication system according to claim 1, wherein the CSG base station is a hybrid base station that can be accessed by CSG terminals and can also be accessed by non-CSG terminals. It is a base station provided in a CSG cell belonging to a CSG of a closed subscriber group, and the mobile terminal is handed over to a base station provided in another cell, or a mobile terminal from a base station provided in another cell CSG base station to be handed over,
A CSG base station characterized in that the handover procedure is different depending on whether the mobile terminal to be handed over is a CSG terminal belonging to a CSG or a non-CSG terminal not belonging to a CSG. Handover from a CSG base station which is a base station provided in a CSG cell belonging to a closed subscriber group CSG to a CSG base station from a base station provided in another cell or a base station provided in another cell A mobile terminal,
A mobile terminal characterized in that the handover procedure is different depending on whether the mobile terminal to be handed over is a CSG terminal belonging to a CSG or a non-CSG terminal not belonging to a CSG.

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